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Make sure a blank title string resets the title (#17802)
## Summary of the Pull Request When a VT title sequence sets the title to a blank string, that is meant to trigger a reset to the default starting value. This used to work in the past because the blank value was dealt with by conhost, so Windows Terminal never received a blank title, but that's no longer the case with the new VT passthrough. This PR fixes the issue by getting Windows Terminal to handle the blank title strings itself. ## References and Relevant Issues VT passthrough was introduced in PR #17510. ## Validation Steps Performed I've manually verified that the `OSC 0`, `OSC 2`, and `DECSWT` sequences now correctly reset the title when passed a blank title string. ## PR Checklist - [x] Closes #17800
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