Change indentation to 2 spaces

To comply with Redmine's coding style.

src/sass/plugins/redmine_backlogs/jquery/jquery.multiselect.scss

@@ -2,117 +2,117 @@
 @import "../common";
 
 .ui-multiselect {
-    padding: 2px 0 2px 4px;
-    text-align: left;
+  padding: 2px 0 2px 4px;
+  text-align: left;
 
-    span.ui-icon {
-        float: right;
-    }
+  span.ui-icon {
+    float: right;
+  }
 }
 
 .ui-multiselect-single .ui-multiselect-checkboxes {
-    input {
-        position: absolute !important;
-        top: auto !important;
-        left: -9999px;
-    }
+  input {
+    position: absolute !important;
+    top: auto !important;
+    left: -9999px;
+  }
 
-    label {
-        padding: 5px !important;
-    }
+  label {
+    padding: 5px !important;
+  }
 }
 
 .ui-multiselect-header {
-    margin-bottom: 3px;
-    padding: 3px;
+  margin-bottom: 3px;
+  padding: 3px;
 
-    ul {
-        font-size: $font-size-list;
+  ul {
+    font-size: $font-size-list;
 
-        li {
-            padding: 0 10px 0 0;
-            float: left;
-        }
+    li {
+      padding: 0 10px 0 0;
+      float: left;
     }
+  }
 
-    a {
-        text-decoration: none;
+  a {
+    text-decoration: none;
 
-        &:hover {
-            text-decoration: underline;
-        }
+    &:hover {
+      text-decoration: underline;
     }
+  }
 
-    span.ui-icon {
-        float: left;
-    }
+  span.ui-icon {
+    float: left;
+  }
 
-    li.ui-multiselect-close {
-        padding-right: 0;
-        float: right;
-        text-align: right;
-    }
+  li.ui-multiselect-close {
+    padding-right: 0;
+    float: right;
+    text-align: right;
+  }
 }
 
 .ui-multiselect-menu {
-    display: none;
-    position: absolute;
-    padding: 3px;
-    text-align: left;
-    z-index: 10000;
-    @include nice-shadow(2);
+  display: none;
+  position: absolute;
+  padding: 3px;
+  text-align: left;
+  z-index: 10000;
+  @include nice-shadow(2);
 }
 
 .ui-multiselect-checkboxes {
-    position: relative;
-    padding-right: 2px;
-    overflow-y: scroll;
+  position: relative;
+  padding-right: 2px;
+  overflow-y: scroll;
 
-    input[type="checkbox"] {
-        top: 0;
-        margin: 3px 0 0 -20px;
-        float: left;
+  input[type="checkbox"] {
+    top: 0;
+    margin: 3px 0 0 -20px;
+    float: left;
 
-        &:focus {
-            outline: none;
-        }
+    &:focus {
+      outline: none;
     }
+  }
 
-    label {
+  label {
+    display: block;
+    padding: 3px 1px;
+    padding-left: 20px + 6px;
+    border: 1px solid transparent;
+    cursor: default;
+    @include user-select(none);
+
+    input {
+      position: relative;
+      top: 1px;
+    }
+  }
+
+  li {
+    clear: both;
+    font-size: $font-size-list;
+
+    &.ui-multiselect-optgroup-label {
+      margin-bottom: 2px;
+      border-bottom: 1px solid $panel-border;
+      font-weight: $font-weight-bold;
+      text-align: center;
+
+      a {
         display: block;
-        padding: 3px 1px;
-        padding-left: 20px + 6px;
-        border: 1px solid transparent;
-        cursor: default;
-        @include user-select(none);
-
-        input {
-            position: relative;
-            top: 1px;
-        }
-    }
-
-    li {
-        clear: both;
-        font-size: $font-size-list;
-
-        &.ui-multiselect-optgroup-label {
-            margin-bottom: 2px;
-            border-bottom: 1px solid $panel-border;
-            font-weight: $font-weight-bold;
-            text-align: center;
-
-            a {
-                display: block;
-                margin: 1px 0;
-                padding: 3px;
-                text-decoration: none;
-            }
-        }
+        margin: 1px 0;
+        padding: 3px;
+        text-decoration: none;
+      }
     }
+  }
 }
 
 // Remove label borders in IE6 because IE6 does not support transparency
 * html .ui-multiselect-checkboxes label {
-    border: 0 none;
+  border: 0 none;
 }