mq: avoid using `__file__` to compare modules
This fixes ~70 tests when using an oxidized executable, bringing the current
failure count down to 92 (with 110 skips) when templates/ is copied next to the
executable.
Differential Revision: https://phab.mercurial-scm.org/D7778
BasedOnStyle: LLVM
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BreakBeforeBraces: Linux
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2