py3: fix test-update-atomic.t
The .replace('o', '') hack on oct() return value is required because:
% python -c 'print(oct(10))'
012
% python3 -c 'print(oct(10))'
0o12
Differential Revision: https://phab.mercurial-scm.org/D5684
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2