Reverts items.atlas and .png to match master, gives new equipment items a placeholder.

forge-gui/res/adventure/common/sprites/items.atlas

@@ -468,9 +468,4 @@ CartoucheOfAmbition
 CartoucheOfZeal
   xy:320,240
   size:16,16
-HallowedSigil
-  xy:320,256
-  size:16,16
-UnhallowedSigil
-  xy:320,272
-  size:16,16
+

forge-gui/res/adventure/common/world/items.json

@@ -1239,7 +1239,7 @@
     "name": "Hallowed Sigil",
 	"description": "Turn a creature hexproof until end of turn.",
     "equipmentSlot": "Neck",
-    "iconName": "HallowedSigil",
+    "iconName": "ChickenEgg",
     "effect": {
       "startBattleWithCard": [
         "Hallowed Sigil"
@@ -1250,7 +1250,7 @@
     "name": "Unhallowed Sigil",
 	"description": "Devour the life of an enemy creature, killing it.",
     "equipmentSlot": "Right",
-    "iconName": "UnhallowedSigil",
+    "iconName": "ChickenEgg",
     "effect": {
       "startBattleWithCard": [
         "Sigil of Torment"