Replace redundant logic in Admin()

The Allowed() function already implements this loop, use it to reduce
redundant code.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

wat/bot.go

@@ -46,13 +46,7 @@ func (w *WatBot) HandleIrcMsg(c *irc.Client, m *irc.Message) {
 }
 
 func (w *WatBot) Admin(m *irc.Message) bool {
-	admins := w.c.AdminHosts 
-	for _, admin := range admins {
-		if m.Prefix.Host == admin {
-			return true
-		}
-	}
-	return false
+	return w.Allowed(m.Prefix.Host, w.c.AdminHosts)
 }
 
 func (w *WatBot) Allowed(c string, r []string) bool {