Fix public page style

* checks if the user is on the login page or not instead of check if the user is logged in
* fixes #3207

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

Author: MorrisJobke

lib/private/TemplateLayout.php

@@ -164,7 +164,7 @@ public function __construct( $renderAs, $appId = '' ) {
 		// Do not load scss for update, errors, installation or login page
 		if(\OC::$server->getSystemConfig()->getValue('installed', false)
 			&& !\OCP\Util::needUpgrade()
-			&& \OC_User::isLoggedIn()) {
+			&& strpos(\OC::$server->getRequest()->getRequestUri(), \OC::$server->getURLGenerator()->linkToRoute('core.login.tryLogin')) !== 0) {
 			$cssFiles = self::findStylesheetFiles(\OC_Util::$styles);
 		} else {
 			$cssFiles = self::findStylesheetFiles(\OC_Util::$styles, false);