Fix vuex typex in tests

frontend/src/components/export/DataExport.vue

@@ -51,17 +51,17 @@
 </template>
 
 <script lang="ts">
-import { Vue, Component, Mixins } from 'vue-property-decorator'
+import Component, { mixins } from 'vue-class-component'
 import { getters } from '@/store/getters'
 import ax, { StudentExportItem, fetchStudentExportData } from '@/api'
 import FileSelect from '@/components/util/FileSelect.vue'
 import { mutations as mut } from '@/store/mutations'
-import { exportMixin, ExportType } from '@/components/mixins/mixins'
+import { ExportType, exportMixin } from '@/components/mixins/exportMixin.ts'
 
 @Component({
   components: { FileSelect }
 })
-export default class DataExport extends Mixins(exportMixin) {
+export default class DataExport extends mixins(exportMixin) {
   exportDialog = true
   mapFile: File | null = null
   setPasswords = false