Auto merge of #9243 - PythonNut:master, r=Wafflespeanut
Auto merge of #9243 - PythonNut:master, r=Wafflespeanut

Fix literal braces in string formatting in tidy.py, fixes #9151

This should be pretty self-explanatory, it's less than a dozen bytes, after all. :)

Fixes #9151.
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