py3: handle keyword arguments correctly in help.py

Differential Revision: https://phab.mercurial-scm.org/D1632

mercurial/help.py

@@ -453,7 +453,7 b' def help_(ui, commands, name, unknowncmd'
                 rst.append(' :%s: %s\n' % (f, h[f]))
 
         ex = opts.get
-        anyopts = (ex('keyword') or not (ex('command') or ex('extension')))
+        anyopts = (ex(r'keyword') or not (ex(r'command') or ex(r'extension')))
         if not name and anyopts:
             exts = listexts(_('enabled extensions:'), extensions.enabled())
             if exts: