subrepo: drop the 'ui' parameter to removefiles()

This no longer needs to be explicitly passed because the subrepo object tracks
the 'ui' reference since fcbc66b5da6a.  See the change to 'archive' for details
about the differences between the output level in the root repo and subrepo 'ui'
object.

The only use for 'ui' in remove is to emit status and warning messages, and to
check the verbose flag prior to printing files to be removed.  The bad() method
on the matcher still uses the root repo's ui, because narrowing the matcher
doesn't change the ui object.

The local repo's ui was already being used to print a warning message in
wctx.forget() and for 'ui.slash' when walking dirstate in the repo.status()
call.

mercurial/cmdutil.py

@@ -2075,8 +2075,7 b' def remove(ui, repo, m, prefix, after, f'
             sub = wctx.sub(subpath)
             try:
                 submatch = matchmod.narrowmatcher(subpath, m)
-                if sub.removefiles(ui, submatch, prefix, after, force,
-                                   subrepos):
+                if sub.removefiles(submatch, prefix, after, force, subrepos):
                     ret = 1
             except error.LookupError:
                 ui.status(_("skipping missing subrepository: %s\n")

mercurial/subrepo.py

@@ -499,7 +499,7 b' class abstractsubrepo(object):'
     def forget(self, match, prefix):
         return ([], [])
 
-    def removefiles(self, ui, matcher, prefix, after, force, subrepos):
+    def removefiles(self, matcher, prefix, after, force, subrepos):
         """remove the matched files from the subrepository and the filesystem,
         possibly by force and/or after the file has been removed from the
         filesystem.  Return 0 on success, 1 on any warning.
@@ -855,8 +855,8 b' class hgsubrepo(abstractsubrepo):'
                               os.path.join(prefix, self._path), True)
 
     @annotatesubrepoerror
-    def removefiles(self, ui, matcher, prefix, after, force, subrepos):
-        return cmdutil.remove(ui, self._repo, matcher,
+    def removefiles(self, matcher, prefix, after, force, subrepos):
+        return cmdutil.remove(self.ui, self._repo, matcher,
                               os.path.join(prefix, self._path), after, force,
                               subrepos)