Land rapid7#4590, jvennix-r7's fix for same-scheme URLs

made a trivial string formatting tweak

Author: Brent Cook

modules/auxiliary/gather/apple_safari_webarchive_uxss.rb

@@ -47,9 +47,9 @@ def initialize(info = {})
     register_options(
       [
         OptString.new('FILENAME', [ true, 'The file name.',  'msf.webarchive']),
-        OptString.new('URLS', [ true, 'A space-delimited list of URLs to UXSS (eg http://browserscan.rapid7.com/']),
+        OptString.new('URLS', [ true, 'A space-delimited list of URLs to UXSS (eg http://rapid7.com http://example.com']),
         OptString.new('URIPATH', [false, 'The URI to receive the UXSS\'ed data', '/grab']),
-        OptString.new('DOWNLOAD_PATH', [ true, 'The path to download the webarhive.', '/msf.webarchive']),
+        OptString.new('DOWNLOAD_PATH', [ true, 'The path to download the webarchive.', '/msf.webarchive']),
         OptString.new('URLS', [ true, 'The URLs to steal cookie and form data from.', '']),
         OptString.new('FILE_URLS', [false, 'Additional file:// URLs to steal.', '']),
         OptBool.new('STEAL_COOKIES', [true, "Enable cookie stealing.", true]),
@@ -768,8 +768,11 @@ def find_cached_scripts
             if script_uri.relative?
               url = page_uri + url
             end
+            if url.to_s.starts_with? '//'
+              url = "#{page_uri.scheme}:#{url}"
+            end
             io = open(url)
-          rescue URI::InvalidURIError => e
+          rescue URI::InvalidURIError, OpenURI::HTTPError
             next
           end