Fix scryfallPriceGenerator script (#2369)

* - Update the MTGDecksNet conversion and AI playability test toolchain to the latest version (Python 3 compatible).

* - Make the input/output folders generic

* - Make the input/output folders generic, part 2.

* - Add the Scryfall all-prices.txt generator script.

* - Minor code cleanup.

* - Improve ConniveAi for Change of Plans.

* - Check if the AI can draw cards for ConniveAI

* - Improve the price generation script to account for the Scryfall set code to Forge set code mapping.
- Tweak paths in some of the scripts.

* - Fix scryfallPricesGenerator.

forge-gui/tools/scryfallPricesGenerator.py

@@ -32,7 +32,7 @@ for filename in files:
         metadata_filename = filename
         break
 
-if metadata_file is None:
+if metadata_filename is None:
     print("Please download the Default Cards bulk data json file from https://scryfall.com/docs/api/bulk-data and place it in the script folder.")
     exit(1)