Improve bindings to better match VS-Code (#8584)

Release Notes:

- Changed default keybindings in the VS Code keymap so that
`alt-[up|down]` now move lines up/down and`alt-shift-[up|down]`
duplicate lines up/down. Previous bindings for selecting larger/smaller
syntax nodes are now bound to `ctrl-shift-[left|right]`.
([#4652](https://github.com/zed-industries/zed/issues/4652))([#7151](https://github.com/zed-industries/zed/issues/7151))

---------

Co-authored-by: Thorsten Ball <mrnugget@gmail.com>

crates/zed/src/app_menus.rs

@@ -99,7 +99,10 @@ pub fn app_menus() -> Vec<Menu<'static>> {
                 MenuItem::separator(),
                 MenuItem::action("Move Line Up", editor::actions::MoveLineUp),
                 MenuItem::action("Move Line Down", editor::actions::MoveLineDown),
-                MenuItem::action("Duplicate Selection", editor::actions::DuplicateLine),
+                MenuItem::action(
+                    "Duplicate Selection",
+                    editor::actions::DuplicateLine::default(),
+                ),
             ],
         },
         Menu {