initiallyOpen in extra-infosbox-prefilled.xml set to true

Classes/Hooks/TCE/TCEMainHook.php

@@ -1546,7 +1546,7 @@ class TCEMainHook
         break;
       case "mrm_be_cm_extra_infosbox_prefilled":
         $type = "typo3_extrainfosbox_prefilled";
-        $open = $flex["isInitialyOpen"] == "0" ? true : false;
+        $open = $flex["isInitialyOpen"] == "1" ? true : false;
         $headline = $flex['headline'];
         $elements = [];