fixed matrikelNr not getting applied correctly

frontend/src/components/export/DataExport.vue

@@ -70,14 +70,10 @@ export default class DataExport extends Mixins(exportMixin) {
   get studentMap () { return getters.state.studentMap }
 
   applyMapping (studentExport: StudentExportItem[]) {
-    console.log(studentExport)
     studentExport.forEach(student => {
       if (this.studentMap[student.Matrikel]) {
-        student = {
-          ...student,
-          Matrikel: this.studentMap[student.Matrikel].matrikelNo,
-          Name: this.studentMap[student.Matrikel].name
-        }
+        student.Name = this.studentMap[student.Matrikel].name
+        student.Matrikel = this.studentMap[student.Matrikel].matrikelNo
       } else {
         this.$notify({
           title: `Unknown student: ${student.Name}`,