fix duplicate function name

suchwow/app.py

@@ -132,7 +132,7 @@ def add_admin(username):
 
 @app.cli.command("remove_admin")
 @click.argument("username")
-def add_admin(username):
+def remove_admin(username):
     m = Moderator.filter(username=username).first()
     if m:
         m.delete_instance()