Fix: [TW] Map detection backend in Daedalian Hymn event

Codes are from old files, so use the old detection method.
Turn on MAP_HAS_WALL in B2B3D2D3

campaign/event_20210624_tw/b2.py

@@ -70,6 +70,8 @@ class Config(ConfigBase):
     MAP_HAS_AMBUSH = False
     # ===== End of generated config =====
 
+    MAP_HAS_WALL = True
+
 
 class Campaign(CampaignBase):
     MAP = MAP