Removed accidental call to expand_url

plugins/octopress_filters.rb

@@ -79,7 +79,7 @@ module OctopressLiquidFilters
   def expand_urls(input, url='')
     url ||= '/'
     input.gsub /(\s+(href|src)\s*=\s*["|']{1})(\/[^\/\"'>]*)(["|']{1})/ do
-      $1 + expand_url($3, url) + $4
+      $1 + $3 + $4
     end
   end