Fixed the Angel Room theme not working.

Keep letting me know if any other sound or theme is not working!

On a side note, thanks for the support! I recently got my hands on Isaac again, this time for good, as I only had it thanks to the old steam game sharing policy (which is why I didn't solve the issue before, as I didn't have it anymore after the policy change), but I'm now back in business! I might make another mod in the future, although I don't know if it will be Dragon Quest related. Eitherway, thanks to everyone using the mod!

Updated some Repentance songs which got mixed up due to a small mistake in the music.xml file.