MDL-29231 - Course, Resource - Fix so that the correct icon is displa…

…yed for courses that have had two or more files uploaded to them - Thanks Michael D for the patch

mod/resource/lib.php

@@ -257,7 +257,7 @@ function resource_get_coursemodule_info($coursemodule) {
     $fs = get_file_storage();
     $files = $fs->get_area_files($context->id, 'mod_resource', 'content', 0, 'sortorder DESC, id ASC', false); // TODO: this is not very efficient!!
     if (count($files) >= 1) {
-        $mainfile = array_pop($files);
+        $mainfile = reset($files);
         $info->icon = file_extension_icon($mainfile->get_filename());
         $resource->mainfile = $mainfile->get_filename();
     }