vim lifecycle (#7647)

Release Notes:

- Fixed :0 and :% in vim mode
([#4303](https://github.com/zed-industries/zed/issues/4303)).
- Improved keymap loading to not load vim key bindings unless vim is
enabled

**or**

- N/A

assets/keymaps/vim.json

@@ -498,7 +498,7 @@
     }
   },
   {
-    "context": "BufferSearchBar && !in_replace > VimEnabled",
+    "context": "BufferSearchBar && !in_replace",
     "bindings": {
       "enter": "vim::SearchSubmit",
       "escape": "buffer_search::Dismiss"