[ios] Allow implicit animation of annotation views

- Allows the user location annotation to again animate its movements while no tracking mode is enabled.

platform/ios/src/MGLAnnotationView.mm

@@ -246,16 +246,6 @@
     return otherGestureRecognizer == _longPressRecognizer || otherGestureRecognizer == _panGestureRecognizer;
 }
 
-- (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event
-{
-    // Allow mbgl to drive animation of this view’s bounds.
-    if ([event isEqualToString:@"bounds"] || [event isEqualToString:@"position"])
-    {
-        return [NSNull null];
-    }
-    return [super actionForLayer:layer forKey:event];
-}
-
 #pragma mark UIAccessibility methods
 
 - (BOOL)isAccessibilityElement {

platform/ios/src/MGLUserLocationAnnotationView.m

@@ -97,14 +97,4 @@
     }
 }
 
-- (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event
-{
-    // Allow mbgl to drive animation of this view’s bounds.
-    if ([event isEqualToString:@"bounds"])
-    {
-        return [NSNull null];
-    }
-    return [super actionForLayer:layer forKey:event];
-}
-
 @end