Fixing check on "remember" parameter presence (#21221)

When a "remember" parameter is passed and it's empty, the user should not be remembered.

Author: zupolgec

src/Illuminate/Foundation/Auth/AuthenticatesUsers.php

@@ -74,7 +74,7 @@ protected function validateLogin(Request $request)
     protected function attemptLogin(Request $request)
     {
         return $this->guard()->attempt(
-            $this->credentials($request), $request->has('remember')
+            $this->credentials($request), $request->filled('remember')
         );
     }