Add web app back button customization

submodules/AttachmentUI/Sources/AttachmentController.swift

@@ -836,11 +836,7 @@ public class AttachmentController: ViewController {
             }
         }
     }
-    
-    deinit {
-        print()
-    }
-    
+        
     public required init(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }