Martin von Zweigbergk <martinvonz@google.com> [Mon, 07 Feb 2022 14:07:04 -0800] rev 48761
simplemerge: remove now-unused arguments
The `ui` argument is no longer needed now that we don't handle
`--print` in the library code.
Differential Revision: https://phab.mercurial-scm.org/D12151