refs #2922: update display link in all common modes (inc. scrolling)

Author: incanus

platform/ios/MGLMapView.mm

@@ -233,7 +233,7 @@ - (void)commonInit
     // setup refresh driver
     _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(updateFromDisplayLink)];
     _displayLink.frameInterval = MGLTargetFrameInterval;
-    [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
+    [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
     _needsDisplayRefresh = YES;
 
     // start paused if in IB