assistant2: Change chat keybinding to just `Enter` (#21819)

Marshall Bowers created

This PR changes the Assistant2 chat keybinding from `Cmd-Enter` to just
`Enter`.

Release Notes:

- N/A

Change summary

assets/keymaps/default-macos.json | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Detailed changes

assets/keymaps/default-macos.json 🔗

@@ -229,7 +229,7 @@
     "context": "MessageEditor > Editor",
     "use_key_equivalents": true,
     "bindings": {
-      "cmd-enter": "assistant2::Chat"
+      "enter": "assistant2::Chat"
     }
   },
   {