Quitting Unsaved Fiddle Should Focus Window

[dsanders11]

Same kind of issue as #1007, it's showing a "Are you sure?" modal but the window isn't focused so the behavior on macOS is trying to quit from the dock seems to have no effect since it's waiting for user input but the user can't see.

Fix should be simple, see #1018 for how #1007 was fixed.

[dsanders11]

Same issue on Linux.

[Hanaffi]

@dsanders11 @codebytere Please assign this to me too

[VerteDinde]

@Hanaffi Please just pick one issue to work on and submit a PR for that issue - particularly for issues labeled “Good First Issue”, we want to give others a chance to work on them 🙂 Once you’ve submitted/merged a PR for one issue, you’re welcome to take on another one, but we’d appreciate contributors working on one issue at a time!