Remove editor::Cancel binding from vim

When you hit <escape> in the command palette, it first editor::Cancel
because the command palette is also a focused editor; this binding was
catching before the `menu::Cancel` that you probably want.

From looking at the uses of editor::Cancel it seems like the only way to
trigger this is with <escape> in an editor. Rather than trying to hook
into the existing editor cancel and add vim-specific behaviour, we'll
instead take responsibility for binding directly to <escape> when
necessary.

Fixes: zed-industries/community#1347

assets/keymaps/vim.json

@@ -93,7 +93,10 @@
       ],
       "ctrl-o": "pane::GoBack",
       "ctrl-]": "editor::GoToDefinition",
-      "escape": "editor::Cancel",
+      "escape": [
+        "vim::SwitchMode",
+        "Normal"
+      ],
       "0": "vim::StartOfLine", // When no number operator present, use start of line motion
       "1": [
         "vim::Number",
@@ -325,7 +328,10 @@
     "bindings": {
       "tab": "vim::Tab",
       "enter": "vim::Enter",
-      "escape": "editor::Cancel"
+      "escape": [
+        "vim::SwitchMode",
+        "Normal"
+      ]
     }
   }
 ]