[tui] Add About page within Help MenuBar.

src/tui/menu_bar.rs

@@ -199,7 +199,7 @@ impl Component for MenuBar {
                             Reload => Ok(Action::ReloadFile),
                             ShowHideExplorer => Ok(Action::ShowHideExplorer),
                             ShowHideLogger => Ok(Action::ShowHideLogger),
-                            About => Ok(Action::About),
+                            About => Ok(Action::ShowHideAbout),
                             CloseTab => Ok(Action::CloseTab),
                         };
                     }