[ios] Use content inset to calculate edge padding (#6313)

This reverts a previous change that used only the contentInset
when setting the center coordinate of the map view.
Instead of contentInset, edgePaddingForFollowing is used. This fixes
a regression that caused the user dot annotation to be misplaced
when the map was configured to show the annotation in any place other
than in the center of the map.

In addition, edgePaddingForFollowing is updated to account for
contentInset when it calculates its UIEdgeInsets. This fixes a bug
where the user dot would move to the center of the content frame
(when it was adjusted for content insets) but the map would not scroll
along with it yielding the effect of the user dot being misplaced.

platform/ios/src/MGLMapView.mm

@@ -4085,7 +4085,7 @@ public:
 - (void)didUpdateLocationIncrementallyAnimated:(BOOL)animated
 {
     [self _setCenterCoordinate:self.userLocation.location.coordinate
-                   edgePadding:self.contentInset
+                   edgePadding:self.edgePaddingForFollowing
                      zoomLevel:self.zoomLevel
                      direction:self.directionByFollowingWithCourse
                       duration:animated ? MGLUserLocationAnimationDuration : 0
@@ -4112,7 +4112,7 @@ public:
     
     __weak MGLMapView *weakSelf = self;
     [self _flyToCamera:camera
-           edgePadding:self.contentInset
+           edgePadding:self.edgePaddingForFollowing
           withDuration:animated ? -1 : 0
           peakAltitude:-1
      completionHandler:^{
@@ -4173,8 +4173,10 @@ public:
     CGRect boundsAroundCorrectPoint = CGRectOffset(bounds,
                                                    correctPoint.x - CGRectGetMidX(bounds),
                                                    correctPoint.y - CGRectGetMidY(bounds));
-    return UIEdgeInsetsMake(CGRectGetMinY(boundsAroundCorrectPoint) - CGRectGetMinY(bounds), 0,
-                            CGRectGetMaxY(bounds) - CGRectGetMaxY(boundsAroundCorrectPoint), 0);
+    return UIEdgeInsetsMake(CGRectGetMinY(boundsAroundCorrectPoint) - CGRectGetMinY(bounds) + self.contentInset.top,
+                            self.contentInset.left,
+                            CGRectGetMaxY(bounds) - CGRectGetMaxY(boundsAroundCorrectPoint) + self.contentInset.bottom,
+                            self.contentInset.right);
 }
 
 /// Returns the edge padding to apply during bifocal course tracking.