Add a note about deleting state.json as well

[zadjii-msft]

"How do I reset my settings in Windows Terminal back to the default settings?" mentions deleting settings.json to revert back to the defaults. However, now we've got state.json as well, and that stores some other important info. So you need to actually delete that file to.

Brought to our attention in microsoft/terminal#11119

[opbld30]

Docs Build status updates of commit 60b2415:

✅ Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/troubleshooting.md	✅Succeeded	View

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