settings: Move settings sanitization to its own function

Creates a new function that can be expanded later to fix other settings that are known to cause emulation errors across executables.

src/core/settings.h

@@ -539,4 +539,7 @@ void LogSettings();
 // Restore the global state of all applicable settings in the Values struct
 void RestoreGlobalState();
 
+// Fixes settings that are known to cause issues with the emulator
+void Sanitize();
+
 } // namespace Settings