It looks like loading the file unfocused the editor. And since it
[wasn't focused we didn't register keyboard
shortcuts](https://github.com/tldraw/tldraw/blob/mitja/fix-keyboardshortcuts/packages/tldraw/src/lib/ui/hooks/useKeyboardShortcuts.ts#L27).
This makes sure that the focus after loading the file stays the same as
it was before loading it.
Fixes: #2028Fixes: #2116
### Change Type
- [x] `patch` — Bug fix
- [ ] `minor` — New feature
- [ ] `major` — Breaking change
- [ ] `dependencies` — Changes to package dependencies[^1]
- [ ] `documentation` — Changes to the documentation only[^2]
- [ ] `tests` — Changes to any test code only[^2]
- [ ] `internal` — Any other changes that don't affect the published
package[^2]
- [ ] I don't know
[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version
### Test Plan
1. Run the VS Code extension.
2. Open a new file with the `tldraw: New project` command.
3. Make sure keyboard shortcuts are working.
### Release Notes
- Fixes keyboard shortcuts for VS Code extension.
1f47a5aef4