macosx: do not send left and right arrow key to controls

The left and right arrow keys have not any real advantage / functionality for
the playlist view or sidebar but are used by default for several hotkeys.
So lets allow these as VLC hotkeys (also for audio files).

modules/gui/macosx/intf.m

@@ -1160,8 +1160,6 @@ static VLCMain *_o_sharedMainInstance = nil;
                 case NSBackspaceCharacter:
                 case NSUpArrowFunctionKey:
                 case NSDownArrowFunctionKey:
-                case NSRightArrowFunctionKey:
-                case NSLeftArrowFunctionKey:
                 case NSEnterCharacter:
                 case NSCarriageReturnCharacter:
                     return NO;