fix selection of mode on login

When the User selects a mode on the login form (ie. setting horde_select_view),
it gets always overwritten by 'auto'. The reason is that during login there is
a cycle that leads to authentication being triggered twice.

The culprit is the call to setAuth at
https://github.com/horde/Core/blob/master/lib/Horde/Core/Auth/Application.php#L669
which ends up triggering a second authentication through

    $this->loadPrefs($this->getApp());

which in turn does not have access to the original $credentials array and then
sets the view to the default value.

This patch breaks the cycle, by preventing the second auth when the first one
did not finish.

Author: o

lib/Horde/Registry.php

@@ -2610,8 +2610,10 @@ public function setAuth($authId, $credentials, array $options = array())
         $this->setAuthCredential($credentials, null, $app);
 
         /* Reload preferences for the new user. */
-        unset($GLOBALS['prefs']);
-        $this->loadPrefs($this->getApp());
+        if ($this->getAuth() == $authId) {
+          unset($GLOBALS['prefs']);
+          $this->loadPrefs($this->getApp());
+        }
 
         $this->setLanguageEnvironment(isset($options['language']) ? $this->preferredLang($options['language']) : null, $app);
     }