sdl: Add missing parentheses to some functions in TODO.md
Audio
-- [x] SDL_NewAudioStream
-- [x] SDL_AudioStreamPut
-- [x] SDL_AudioStreamGet
-- [x] SDL_AudioStreamAvailable
-- [x] SDL_AudioStreamFlush
-- [x] SDL_AudioStreamClear
-- [x] SDL_FreeAudioStream
+- [x] SDL_NewAudioStream()
+- [x] SDL_AudioStreamPut()
+- [x] SDL_AudioStreamGet()
+- [x] SDL_AudioStreamAvailable()
+- [x] SDL_AudioStreamFlush()
+- [x] SDL_AudioStreamClear()
+- [x] SDL_FreeAudioStream()
Joystick
