Use visibility bar button item selection state instead of changing icon

Tusker/Screens/Conversation/ConversationTableViewController.swift

@@ -304,7 +304,16 @@ class ConversationTableViewController: EnhancedTableViewController {
     }
     
     @objc func toggleVisibilityButtonPressed() {
+        #if SDK_IOS_15
+        if #available(iOS 15.0, *) {
+            visibilityBarButtonItem.isSelected = !visibilityBarButtonItem.isSelected
+            showStatusesAutomatically = visibilityBarButtonItem.isSelected
+        } else {
+            showStatusesAutomatically = !showStatusesAutomatically
+        }
+        #else
         showStatusesAutomatically = !showStatusesAutomatically
+        #endif
         
         let snapshot = dataSource.snapshot()
         for case let .status(id: _, state: state) in snapshot.itemIdentifiers where state.collapsible == true {