[VC] fixing StopAllScreenShare.

Current code accidentally skipped a crucial part of the code.

Correct it with the right bracket.

Bug: 1464249, b/272402153

Change-Id: I4f5a872d97fe82eff3cd4a603f7fe65352b29014
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4692483


Reviewed-by: Elad Alon <eladalon@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Elad Alon <eladalon@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1171621}