fix: count the Marathon data trees as game data

bios/Bungie holds the Marathon scenarios Aleph One reads, entries its profile files as category game_data. Listed with the other publishers' trees, they leave the system files count and sit under Game engines and PC games on the site.

scripts/common.py

@@ -2003,6 +2003,7 @@ GAME_DATA_TOPS = (
     "3D Realms",
     "Apogee",
     "Blizzard",
+    "Bungie",
     "Crack dot Com",
     "Electronic Arts",
     "Epic MegaGames",