fix: adjust default value of openByDefault in groups to false

Related to camunda/camunda-modeler#5039

Author: Buckwich

packages/zeebe-element-templates-json-schema/src/defs/groups.json

@@ -8,8 +8,8 @@
       "openByDefault": {
         "$id": "#/groups/group/openByDefault",
         "type": "boolean",
-        "description": "Specifies whether the Group should be opened when first viewed. Defaults to true.",
-        "default": true
+        "description": "Specifies whether the Group should be opened when first viewed. Defaults to false.",
+        "default": false
       }
     }
   }