load webcomponents as non-module

Author: silverwind

templates/base/head_script.tmpl

@@ -47,4 +47,5 @@ If you introduce mistakes in it, Gitea JavaScript code wouldn't run correctly.
 	{{/* in case some pages don't render the pageData, we make sure it is an object to prevent null access */}}
 	window.config.pageData = window.config.pageData || {};
 </script>
-<script type="module" src="{{AssetUrlPrefix}}/webcomponents.js?v={{AssetVersion}}"></script>
+{{/* not using type=module to avoid flicker */}}
+<script src="{{AssetUrlPrefix}}/webcomponents.js?v={{AssetVersion}}"></script>