Balance Changes
Buffed the Sinner's Grade 2 skill "Confusion Shot". It now gains additional activations as the skill level increases.
Improvements
Fixed typos in several spell descriptions.
Added a new option in the Settings menu to enable or disable BGM and sound effects while the game is running in the background.

Bug Fixes
Fixed a bug where BGM would stop when the game was running in the background, but sound effects would continue playing.
Fixed a bug where Slot Machine and Food Distribution would fail to dispense any items when obtained in the shop.
Fixed the Endless Mode leaderboard for the Space stage, which was sorting results in ascending order instead of descending order.
