MDL-51040 cbe: Fix invalid structure returned from webservice

This exporter was exporting a user_competency_plan in a user_competency
structure which is invalid because status is missing.

admin/tool/lp/classes/external/user_competency_summary_exporter.php

@@ -110,7 +110,7 @@ protected function get_other_values(renderer_base $output) {
         }
         if ($this->related['usercompetencyplan']) {
             $exporter = new user_competency_plan_exporter($this->related['usercompetencyplan'], $related);
-            $result->usercompetency = $exporter->export($output);
+            $result->usercompetencyplan = $exporter->export($output);
         }
 
         $allevidence = array();