Fix foreignkey selects

aleksis/apps/kolego/frontend/components/Absences.vue

@@ -62,7 +62,6 @@ import DateTimeField from "aleksis.core/components/generic/forms/DateTimeField.v
           item-value="id"
           v-bind="attrs"
           v-on="on"
-          return-object
           required
           :rules="required"
         />
@@ -84,7 +83,6 @@ import DateTimeField from "aleksis.core/components/generic/forms/DateTimeField.v
           item-value="id"
           v-bind="attrs"
           v-on="on"
-          return-object
         />
       </div>
     </template>