cmdutil: migrate previously missed instances to uipathfn
I seem to have missed these two instances in
15f63ac122ea (files:
respect ui.relative-paths, 2019-01-29) and
7068c6b0114b (revert:
respect ui.relative-paths, 2019-02-05).
Differential Revision: https://phab.mercurial-scm.org/D5915
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