[iOS] Remove unneccessary pitch check

Fix case where moving the tilted dot off-screen, changing the pitch to 0, and then moving the dot back on screen would not reset the pitch of the dot.

platform/ios/MGLUserLocationAnnotationView.m

@@ -95,7 +95,7 @@ - (void)setupLayers
 
 - (void)updatePitch
 {
-    if (self.mapView.camera.pitch && (self.mapView.camera.pitch != _oldPitch))
+    if (self.mapView.camera.pitch != _oldPitch)
     {
         CATransform3D t = CATransform3DRotate(CATransform3DIdentity, MGLRadiansFromDegrees(self.mapView.camera.pitch), 1.0, 0, 0);
         self.layer.sublayerTransform = t;