shelve: pass 'editform' argument to 'cmdutil.getcommiteditor'

This patch passes 'editform' argument according to the format below:

  EXTENSION[.COMMAND][.ROUTE]

  - EXTENSION: name of extension
  - COMMAND: name of command, if there are two or more commands in EXTENSION
  - ROUTE: name of route, if there are two or more routes in COMMAND

In this patch:

  - 'shelve' is used as COMMAND
  - ROUTE is omitted

hgext/shelve.py

@@ -178,8 +178,9 b' def createcmd(ui, repo, pats, opts):'
         if hasmq:
             saved, repo.mq.checkapplied = repo.mq.checkapplied, False
         try:
+            editor = cmdutil.getcommiteditor(editform='shelve.shelve', **opts)
             return repo.commit(message, user, opts.get('date'), match,
-                               editor=cmdutil.getcommiteditor(**opts))
+                               editor=editor)
         finally:
             if hasmq:
                 repo.mq.checkapplied = saved