Might as well format the url all at once.

Author: Brent Cook

modules/auxiliary/gather/apple_safari_webarchive_uxss.rb

@@ -769,7 +769,7 @@ def find_cached_scripts
               url = page_uri + url
             end
             if url.to_s.starts_with? '//'
-              url = "#{page_uri.scheme}:"+url
+              url = "#{page_uri.scheme}:#{url}"
             end
             io = open(url)
           rescue URI::InvalidURIError, OpenURI::HTTPError