fix(targetchange,targetproblem): folow method call signature for fields plugin

Author: btry

inc/targetchange.class.php

@@ -702,7 +702,7 @@ public function save(PluginFormcreatorFormAnswer $formanswer): ?CommonDBTM {
 
       $data = $this->prepareUploadedFiles($data, $formanswer);
 
-      $this->appendFieldsData($formanswer, $data);
+      $data = $this->appendFieldsData($data, $formanswer);
 
       // Cleanup actors array
       $data = $this->cleanActors($data);

inc/targetproblem.class.php

@@ -222,7 +222,7 @@ public function save(PluginFormcreatorFormAnswer $formanswer): ?CommonDBTM {
 
       $data = $this->prepareUploadedFiles($data, $formanswer);
 
-      $this->appendFieldsData($formanswer, $data);
+      $data = $this->appendFieldsData($data, $formanswer);
 
       // Cleanup actors array
       $data = $this->cleanActors($data);