Removes any html tags (or data between "<" and ">" in playlist arguments

This appears to be safe to me.  We do allow arguments to be sent to scripts,
and this would prevent ">" from being used, but I think that is a good thing.
Releated to https://www.huntr.dev/bounties/30-other-FalconChristmas/fpp/

www/js/fpp.js

@@ -1761,7 +1761,7 @@ function AddPlaylistEntry(mode) {
             }
             pe[a.name] = arr;
         } else if ((a.type == 'string') || (a.type == 'file')) {
-            pe[a.name] = $('#playlistEntryOptions').find('.arg_' + a.name).val();
+            pe[a.name] = $('#playlistEntryOptions').find('.arg_' + a.name).val().replace(/<\/?[^>]+(>|$)/g, "");
         } else {
             pe[a.name] = $('#playlistEntryOptions').find('.arg_' + a.name).html();
         }