Only convert to UTF8 if we aren't running under UTF8.

Please, test this is correct, thanks!

mod/hotpot/lib.php

@@ -1255,7 +1255,9 @@ class hotpot_xml_tree {
 		if (empty($str)) {
 			$this->xml =  array();
 		} else {
-			$str = utf8_encode($str);
+            if (empty($CFG->unicodedb)) {
+			    $str = utf8_encode($str);
+            }
 			$this->xml =  xmlize($str, 0);
 		}
 		$this->xml_root = $xml_root;

question/format/hotpot/format.php

@@ -472,7 +472,9 @@ class hotpot_xml_tree {
             // encode htmlentities in JCloze
             $this->encode_cdata($str, 'gap-fill');
             // encode as utf8
-            $str = utf8_encode($str);
+            if (empty($CFG->unicodedb)) {
+                $str = utf8_encode($str);
+            }
             // xmlize (=convert xml to tree)
             $this->xml =  xmlize($str, 0);
         }

question/format/qti2/format.php

@@ -387,7 +387,11 @@ function handle_questions_media(&$questions, $path, $courseid) {
         $smarty->assign('course', $course);
         $smarty->assign('lang', $this->lang);
         $expout = $smarty->fetch('imsmanifest.tpl');
-        echo utf8_encode($expout);
+        if (!empty($CFG->unicodedb)) {
+            echo $expout;
+        } else {
+            echo utf8_encode($expout);
+        }
         return true;
     }