Add sublime keybinding for git::Restore (#28444)

Release Notes:

- Sublime Keymap: Added `git::Restore` compatibility bind (revert_hunk).
Mac: `cmd-k cmd-z` and Linux: `ctrl-k ctrl-z`.

assets/keymaps/linux/sublime_text.json

@@ -58,6 +58,12 @@
       "ctrl-r": "outline::Toggle"
     }
   },
+  {
+    "context": "Editor && !agent_diff",
+    "bindings": {
+      "ctrl-k ctrl-z": "git::Restore"
+    }
+  },
   {
     "context": "Pane",
     "bindings": {