outline_panel: Fix j and k not working in outline panel filter (#17293)

Closes #17248

Release Notes:

- Fixed outline panel filter not working for certain Vim bindings
([#17248](https://github.com/zed-industries/zed/issues/17248))

assets/keymaps/default-linux.json

@@ -521,7 +521,7 @@
     }
   },
   {
-    "context": "OutlinePanel",
+    "context": "OutlinePanel && not_editing",
     "bindings": {
       "escape": "menu::Cancel",
       "left": "outline_panel::CollapseSelectedEntry",

assets/keymaps/default-macos.json

@@ -528,7 +528,7 @@
     }
   },
   {
-    "context": "OutlinePanel",
+    "context": "OutlinePanel && not_editing",
     "bindings": {
       "escape": "menu::Cancel",
       "left": "outline_panel::CollapseSelectedEntry",

assets/keymaps/vim.json

@@ -489,7 +489,7 @@
     }
   },
   {
-    "context": "OutlinePanel",
+    "context": "OutlinePanel && not_editing",
     "bindings": {
       "j": "menu::SelectNext",
       "k": "menu::SelectPrev",