Fix preloading

Author: LBeckX

src/EventListener/Loader2/Loader2JS.php

@@ -48,7 +48,7 @@ public function generateTemplateFiles(PageModel $page, LayoutModel $layout, Page
                     $GLOBALS['TL_HEAD'][] = $this->_getScriptTag($link);
                     break;
                 case 'preload_push':
-                    header("Link: <" . $link . ">; rel=preload; as=script>", false);
+                    header("Link: <" . $link . ">; rel=preload; as=script", false);
                     array_unshift($GLOBALS['TL_HEAD'], $this->_getScriptTag($link));
                     break;
                 case 'defer':

src/EventListener/Loader2/Loader2Style.php

@@ -44,7 +44,7 @@ public function generateTemplateFiles(PageModel $page, LayoutModel $layout, Page
                     $GLOBALS['TL_HEAD'][] = $this->_getStyleTag($link);
                     break;
                 case 'preload_push':
-                    header("Link: <" . $link . ">; rel=preload; as=style>", false);
+                    header("Link: <" . $link . ">; rel=preload; as=style", false);
                     $GLOBALS['TL_HEAD'][] = $this->_getStyleTag($link);
                     break;
                 case 'delay':