Fix build breakage.

Signal/src/ViewControllers/MediaPageViewController.swift

@@ -771,7 +771,7 @@ extension MediaPageViewController: GalleryRailViewDelegate {
             return
         }
 
-        let direction: NavigationDirection = currentItem.albumIndex < targetItem.albumIndex ? .forward : .reverse
+        let direction: UIPageViewControllerNavigationDirection = currentItem.albumIndex < targetItem.albumIndex ? .forward : .reverse
 
         self.setCurrentItem(targetItem, direction: direction, animated: true)
     }

Signal/src/views/CaptionView.swift

@@ -68,7 +68,7 @@ public class CaptionContainerView: UIView {
         pendingCaptionView.autoPinEdge(toSuperviewEdge: .top, withInset: 0, relation: .greaterThanOrEqual)
     }
 
-    required init?(coder aDecoder: NSCoder) {
+    public required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }