Fix init launch sandbox script (#1284)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

packages/cursorless-vscode-core/scripts/initLaunchSandbox.ts

@@ -3,6 +3,11 @@
  * allowing you to have a separate set of extensions and settings for use when
  * developing the Cursorless VSCode extension locally.
  */
+
+// Ensures that the aliases such as @cursorless/common that we define in
+// package.json are active
+import "module-alias/register";
+
 import { extensionDependencies } from "@cursorless/common";
 import * as cp from "child_process";