chore: avoid special sequence that breaks license plugin

Author: javier-godoy

src/main/resources/META-INF/resources/frontend/code-viewer.ts

@@ -250,7 +250,7 @@ pre[class*="language-"] {
       let end = text.indexOf('*/');
       if (end<0) break;
 
-      let pos = text.indexOf('#%L');
+      let pos = text.indexOf('#'+'%L');
       if (pos<0 || end<pos) break;
 
       let license = text.substring(pos+3,end).split('%%');