Issue 3192362: patch per suggestion from https://www.drupal.org/u/imonemus

This change codifies the suggestion by the issue submitter. The media file URL is already URL encoded prior to it being used, and is then URL encoded again, resulting in double URL encoding. The issue manifests when the original URL to the media file contains URL-unsafe characters and is therefore URL encoded. When the module consumes this URL, it's URL a second time resulting in the issue. The suggested fix is to perform a URL decode operation prior to using the value.