tests: escape backslash in makepatch.py inline file
This avoids some SyntaxWarning on Python 3.8 due to unescaped \.
Differential Revision: https://phab.mercurial-scm.org/D5840
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2