fixes a capitalization in the music link

Now the link should say POWBlock instead of POWblock

Author: phellen007

_maps/POWBlock/powblock.yaml

@@ -30,7 +30,7 @@ background: bg006fixed
 mapIcon: pow_ICON
 music:
   download:
-  - https://nikkums.io/cswt/BGM/POWblock.music.zip
+  - https://nikkums.io/cswt/BGM/POWBlock.music.zip
   - https://drive.google.com/uc?export=download&id=1Fv4sSkkjPWI2UXMRQIYtk_ARUUOsWq5Z
   map:
   - nsmbwii_pb_MAP01