Prefer later bindings in keymap section for display in UI (#23378)

Closes #23015

Release Notes:

- Improved which keybindings are selected for display. Now later entries
within `bindings` will take precedence. The default keymaps have been
updated accordingly.

crates/gpui/src/platform/mac/platform.rs

@@ -292,6 +292,7 @@ impl MacPlatform {
             } => {
                 let keystrokes = keymap
                     .bindings_for_action(action.as_ref())
+                    .rev()
                     .next()
                     .map(|binding| binding.keystrokes());