Fix shape tuple syntax in tensorqs_tutorial.py

[horno1337]

removed unnecessary coma from the 'shape' tuple ;)

Description

removed an unnecessary coma from a tuple, no issue has been raised for this so I didn't reference any.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

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