test: stabilize bundle generation for test-sparse-revlog.t
To reduce the instability in the bundle binary content, we force it to contains
delta against p1 in all cases.
In the previous changeset, we already stabilized the processing of the bundle.
So we don't see any output change in the test itself.
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2