test: simplify `debugformat` matching in test-phases.t
This will make the test less sensible to unrelated format changing.
Differential Revision: https://phab.mercurial-scm.org/D11894
BasedOnStyle: LLVM
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2