change legacy snippets to use named exports and move from dedent-tabs to dedent

themes/Legacy/5ePHB/snippets/coverpage.gen.js

@@ -98,8 +98,8 @@ const subtitles = [
 ];
 
 
-export default ()=>{
-	return `<style>
+function coverPageGen() {
+return `<style>
   .phb#p1{ text-align:center; }
   .phb#p1:after{ display:none; }
 </style>
@@ -114,4 +114,6 @@ export default ()=>{
 </div>
 
 \\page`;
-};
+}
+
+export default coverPageGen;