Delete unused class

modules/core/templates/loginuserpass.twig

@@ -25,7 +25,7 @@
 
     <h1>{{ 'Enter your username and password'|trans }}</h1>
 
-    <p class="logintext">{{ 'A service has requested you to authenticate yourself. Please enter your username and password in the form below.'|trans }}</p>
+    <p>{{ 'A service has requested you to authenticate yourself. Please enter your username and password in the form below.'|trans }}</p>
     <br>
     <div class="center">
         <form class="pure-form pure-form-aligned center-form" action="?" method="post" name="f">