[iOS] Fix multitouch not working correctly

(cherry picked from commit 15ef056997190b288d0951ba5cc6414ce3f780a6)

platform/iphone/godot_view.mm

@@ -145,6 +145,8 @@ static const int max_touches = 8;
 
 	[self initTouches];
 
+	self.multipleTouchEnabled = YES;
+
 	// Configure and start accelerometer
 	if (!self.motionManager) {
 		self.motionManager = [[CMMotionManager alloc] init];