mq: removed -m from qpush help (Issue2401)

The -m option became deprecated in changeset bcf90e712dc3,
but the option still appeared in the help line for the qpush
command

hgext/mq.py

@@ -2952,7 +2952,7 b' cmdtable = {'
           ('n', 'name', '',
            _('merge queue name (DEPRECATED)'), _('NAME')),
           ('', 'move', None, _('reorder patch series and apply only the patch'))],
-         _('hg qpush [-f] [-l] [-a] [-m] [-n NAME] [--move] [PATCH | INDEX]')),
+         _('hg qpush [-f] [-l] [-a] [-n NAME] [--move] [PATCH | INDEX]')),
     "^qrefresh":
         (refresh,
          [('e', 'edit', None, _('edit commit message')),