Fix Cmd+\ for workspace::ToggleLeftDock for Atom base keymap (#14098)

Release Notes:

- Fixed Left Dock in Atom keymap on Mac/Linux (`cmd-\`, `ctrl-\`) 
 ([#14098](https://github.com/zed-industries/zed/pull/14098), thanks [@audionerd](https://github.com/audionerd)).

---------

Co-authored-by: Peter Tripp <peter@zed.dev>

assets/keymaps/linux/atom.json

@@ -25,6 +25,7 @@
       "ctrl-shift-d": "editor::DuplicateLineDown", // editor:duplicate-lines
       "ctrl-up": "editor::MoveLineUp", // editor:move-line-up
       "ctrl-down": "editor::MoveLineDown", // editor:move-line-down
+      "ctrl-\\": "workspace::ToggleLeftDock", // tree-view:toggle
       "ctrl-shift-m": "markdown::OpenPreviewToTheSide" // markdown-preview:toggle
     }
   },

assets/keymaps/macos/atom.json

@@ -26,6 +26,7 @@
       "cmd-shift-d": "editor::DuplicateLineDown",
       "ctrl-cmd-up": "editor::MoveLineUp",
       "ctrl-cmd-down": "editor::MoveLineDown",
+      "cmd-\\": "workspace::ToggleLeftDock",
       "ctrl-shift-m": "markdown::OpenPreviewToTheSide"
     }
   },