scholo: revert image swap experiment, keep kg's native 6144x4096 maps

Tried replacing kg's 4 scholo floors with the upreza Dungeons stitched maps (which have room labels baked in: Reliquary, Chamber of Summoning, Butcher's Sanctum, etc.). But kg renders to 3:2 aspect (6144x4096) while upreza is 4:3 (4096x3072) and the WoW client's source content is positioned differently in each — linear rescale of kg's enemy coords lands bosses outside the rooms.

Better to keep kg's lower-quality but coord-aligned maps. dungeon_replacements / map_image_swaps mechanisms are still there for future cases where we DO have a coord-compatible replacement.

WoWMapUprezClassic doesn't help here — the README notes that vanilla never had in-game dungeon interior maps.

data/ascension_overrides.json

@@ -4,6 +4,9 @@
   "_dungeon_replacements_comment": "When the kg map is the wrong layout for Ascension (e.g. retail/Cata layout vs classic), replace the entire dungeon's map with one we author manually. Coords are in the new map's pixel space (0..width, 0..height). Bosses come from AtlasLoot's per-dungeon entries with cords.",
   "dungeon_replacements": {},
 
+  "_map_image_swaps_comment": "Swap the rendered image for one or more floors WITHOUT changing the kg enemy/pack/patrol data. Coords stay in kg's pixel space; the swapped image is force-stretched to those dims by the browser. Use this when a different render of the SAME WoW texture is sharper but has a different aspect ratio.",
+  "map_image_swaps": {},
+
   "overrides": [
     {
       "tile_key": "stratholme",