Fix for advanced editor theme

On line 847 in kaltura.theming.inc, there was a function named incorrectly, which was causing the advanced editor to not load:

function theme_advanced_editor($theme_params, $no_refresh) {

should be:

function theme_kaltura_advanced_editor($theme_params, $no_refresh) {

Patch attached. Not sure I generated that right, but the fix is fairly simple..