[FormBundle] Fix select2 style (#1873) (#1879)

| Q            | A
|--------------| ---
| Bug fix?     | yes
| New feature? | no
| BC-Break?    | no
| License      | MIT

Fixed style errors in enhavo backend caused by importing select2 css a second time after the intern style corrections

(cherry picked from commit 2471ebeb523b2081de76ef04af26d42fbba2d194)

Co-authored-by: FabianLiebl <fabian.liebl@xq-web.de>

components/FormChoiceCollapsedComponent.vue

@@ -14,7 +14,6 @@ import * as _ from "lodash";
 import {ChoiceForm} from "@enhavo/vue-form/model/ChoiceForm";
 import * as $ from "jquery";
 import "select2";
-import 'select2/select2.css'
 
 @Options({})
 export default class extends Vue