Remove unneeded Dispose

Author: bclothier

Rubberduck.Core/UI/Command/MenuItems/CommandBars/AppCommandBarBase.cs

@@ -200,7 +200,6 @@ public void RemoveCommandBar()
                     Logger.Debug("Removing commandbar.");
                     RemoveChildren();
                     Item.Delete();
-                    Item.Dispose();
                     Item = null;
                     Parent = null;
                 }