Plugin: Remove duplicate !list command

It also exists in Misc.

plugins/Plugin/plugin.py

@@ -57,17 +57,6 @@ class Plugin(callbacks.Plugin):
             irc.reply(_('That plugin is loaded, but has no plugin help.'))
     help = wrap(help, ['plugin'])
 
-    @internationalizeDocstring
-    def list(self, irc, msg, args):
-        """takes no arguments
-
-        Returns a list of the currently loaded plugins.
-        """
-        L = [cb.name() for cb in irc.callbacks]
-        L.sort()
-        irc.reply(format('%L', L))
-    list = wrap(list)
-
     @internationalizeDocstring
     def plugin(self, irc, msg, args, command):
         """<command>