Remove $ from filenames downloaded by podcast downloader job, a=chris

diff --git a/src/library/media_jobs/PodcastDownloadJob.php b/src/library/media_jobs/PodcastDownloadJob.php
index c0d189b30..8778e2381 100644
--- a/src/library/media_jobs/PodcastDownloadJob.php
+++ b/src/library/media_jobs/PodcastDownloadJob.php
@@ -843,7 +843,8 @@ class PodcastDownloadJob extends MediaJob
     private function makeFileNamePattern($file_name, $file_pattern,
         $title = "", $pubdate = null)
     {
-        $translates = ["'" => "", "\"" => "", "/" => "-", "|" => "-"];
+        $translates = ["'" => "", "\"" => "", "/" => "-", "|" => "-",
+            '$' => '',];
         $file_name_parts = explode("?", $file_name);
         $file_name = strtr(basename($file_name_parts[0]), $translates);
         $title = strtr($title, $translates);