Match VSCode behavior for ctrl-a/ctrl-e on MacOS (#15981)

- Make `ctrl-a` and `ctrl-e` ignore soft_wraps on MacOS, matching the behavior of VSCode.
- Unchanged: `home`, `end`, `cmd-left`, `cmd-right` respect softwrap (both in Zed and VSCode).

assets/keymaps/default-macos.json

@@ -89,9 +89,9 @@
       "alt-right": "editor::MoveToNextWordEnd",
       "alt-f": "editor::MoveToNextWordEnd",
       "cmd-left": "editor::MoveToBeginningOfLine",
-      "ctrl-a": "editor::MoveToBeginningOfLine",
+      "ctrl-a": ["editor::MoveToBeginningOfLine", { "stop_at_soft_wraps": false }],
       "cmd-right": "editor::MoveToEndOfLine",
-      "ctrl-e": "editor::MoveToEndOfLine",
+      "ctrl-e": ["editor::MoveToEndOfLine", { "stop_at_soft_wraps": false }],
       "cmd-up": "editor::MoveToBeginning",
       "cmd-down": "editor::MoveToEnd",
       "shift-up": "editor::SelectUp",