Revert "add another ratelimit by username"

This reverts commit 4385bafa85.

files/routes/login.py

@@ -80,8 +80,8 @@ def login_deduct_when(resp):
 	return g.login_failed
 
 @app.post("/login")
-@limiter.limit("6/minute;10/day", deduct_when=login_deduct_when)
-@limiter.limit("6/minute;10/day", key_func=lambda:request.values.get("username").lower(), deduct_when=login_deduct_when)
+@limiter.limit("6/minute;10/day",
+	deduct_when=login_deduct_when)
 def login_post():
 	template = ''
 	g.login_failed = True