Sudo: revert previous fix and add a more convenient one.

Sudo/plugin.py

@@ -190,16 +190,12 @@ class Sudo(callbacks.Plugin):
         if name is None:
             log.warning('Sudo not granted to "%s"' % msg.prefix)
             irc.error(_('Sudo not granted.'))
-        elif __builtins__['any']([(x in msg.nick) for x in bannedChars]):
-            log.warning(('Prevent "%s" from using Sudo because there are banned'
-                    'characters in his nick.') % msg.prefix)
-            irc.error(_('You are not allowed to use Sudo because you have '
-                    'banned characters in your nick'))
         else:
             assert rule is not None
             log.info('Sudo granted to "%s" with rule %s' % (msg.prefix, name))
             msg.prefix = rule.hostmask
             tokens = callbacks.tokenize(command)
+            msg.nick = msg.prefix.split('!')[0]
             self.Proxy(irc.irc, msg, tokens)
     sudo = wrap(sudo, ['text'])