Remove loading state handing

Is now done in loadingMixin of createOrPatchMixin.

aleksis/apps/alsijil/frontend/components/coursebook/documentation/LessonSummary.vue

@@ -95,13 +95,11 @@ export default {
       topic: "",
       homework: "",
       groupNote: "",
-      loading: false,
     };
   },
   methods: {
     handleUpdateAfterCreateOrPatch(itemId, wasCreate) {
       return (cached, incoming) => {
-        this.loading = false;
         for (const object of incoming) {
           console.log("summary: handleUpdateAfterCreateOrPatch", object);
           // Replace the current documentation
@@ -120,8 +118,6 @@ export default {
         const homework = this.homework ? { homework: this.homework } : {};
         const groupNote = this.groupNote ? { groupNote: this.groupNote } : {};
 
-        this.loading = true;
-
         this.createOrPatch([
           {
             id: this.documentation.id,