Topic/1281 generic organization membership function

coscine/issues#1281

src/CreateProject.vue

@@ -695,7 +695,7 @@ export default Vue.extend({
     this.startDateSelected(new Date());
 
     OrganizationApi.isRWTHMember((response: any) => {
-      this.isRWTHMember = response.data.isRWTHMember;
+      this.isRWTHMember = response.data.isMember;
     });
 
     VisibilityApi.getVisibilities((response: any) => {