refactor: remove old frame pacing setting as it's no longer used

VoidLink/Database/TemporarySettings.h

@@ -51,7 +51,6 @@
 @property (nonatomic) BOOL enablePIP;
 @property (nonatomic) BOOL reverseMouseWheelDirection;
 @property (nonatomic, retain) NSNumber * asyncNativeTouchPriority;
-@property (nonatomic) BOOL useFramePacing;
 @property (nonatomic) BOOL multiController;
 @property (nonatomic) BOOL swapABXYButtons;
 @property (nonatomic) BOOL playAudioOnPC;