cmdutil: avoid wrapping ctx.phasestr() by _()

This wrapping seems meaningless, because:

  - there is no "_()" invocation to prepare for extracting phase names
    to be translated

    "make update-pot" doesn't extract msgids for phase names

  - phase names are kine of reserved keywords like as branch name "default"

mercurial/cmdutil.py

@@ -1142,7 +1142,7 b' class changeset_printer(object):'
                               label='log.%s' % ns.colorname)
         if self.ui.debugflag:
             # i18n: column positioning for "hg log"
-            self.ui.write(_("phase:       %s\n") % _(ctx.phasestr()),
+            self.ui.write(_("phase:       %s\n") % ctx.phasestr(),
                           label='log.phase')
         for pctx in self._meaningful_parentrevs(ctx):
             label = 'log.parent changeset.%s' % pctx.phasestr()