[ios] Fix conflict between view dragging gesture and quick zoom (#5506)

This stops the quick zoom gesture (double-tap and hold) from also triggering a drag, when performed on a draggable annotation view.

platform/ios/src/MGLAnnotationView.mm

@@ -238,7 +238,7 @@
 
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {
-    return YES;
+    return otherGestureRecognizer == _longPressRecognizer || otherGestureRecognizer == _panGestureRecognizer;
 }
 
 - (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event