Hotpot enhancement to include SWF and FLV files with the mediaplugin

Hotpot enhancement to include SWF and FLV files with the mediaplugin.

In the file "/mod/hotpot/lib.php", function "adjust_media_urls()", just change the line

$filetype = "avi|mpeg|mpg|mp3|mov|wmv";

with the line

$filetype = "avi|mpeg|mpg|mp3|mov|wmv|swf|flv";