webui: fix password string length limitation

This PR removes the max string length value from the form data input
filter validator for the password input field to allow passwords
longer than 64 characters.

Fixes #1480: password string length limitation

webui/module/Auth/src/Auth/Model/Auth.php

@@ -72,7 +72,7 @@ public function getInputFilter()
                   'options' => array(
                      'encoding' => 'UTF-8',
                      'min' => 1,
-                     'max' => 64,
+                     'max' => 128,
                   ),
                ),
             ),
@@ -88,7 +88,6 @@ public function getInputFilter()
          'options' => array(
              'encoding' => 'UTF-8',
              'min' => 1,
-             'max' => 64,
          ),
           ),
       ),