erp5_web_renderjs_ui: File with HTML content type are returned as is

Formerly the "base" tag was introduced in the header.

bt5/erp5_web_renderjs_ui/SkinTemplateItem/portal_skins/erp5_web_renderjs_ui/File_viewAsWeb.py

@@ -6,6 +6,9 @@ if response is None:
 file = context
 file_content = file.getData()
 
+# The vanilla HTML is wanted
+response.setBase(None)
+
 if REQUEST.getHeader('If-Modified-Since', '') == file.getModificationDate().rfc822():
   response.setStatus(304)
   return ""