fix bug: change class/type of selected objects

Former-commit-id: a708e6dfef3fded6c894b38f1fe1b0139ddd583e

Author: walzimmer

js/util/boundingbox.js

@@ -121,7 +121,7 @@ let annotationObjects = {
         // update class of folder and track id instead of creating new folder
         folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[0].innerHTML = newClassLabel + ' ' + nextTrackIdNewClass;
         //                                                           ul        number      div       div[class c]    input
-        folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[3].children[0].children[1].children[0].value = nextTrackIdNewClass;
+        folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[4].children[0].children[1].children[0].value = nextTrackIdNewClass;
 
         // open current folder
         folderBoundingBox3DArray[selectedObjectIndex].open();