OZG-4381 change reply selector to checkbox

.../postfach-nachricht-reply-editor-container.component.html

...stfach-nachricht-reply-editor-container.component.spec.ts

...er/postfach-nachricht-reply-editor-container.component.ts

.../src/lib/ui/editor/enum-editor/enum-editor.component.html

...c/lib/ui/editor/enum-editor/enum-editor.component.spec.ts

...ui/src/lib/ui/editor/enum-editor/enum-editor.component.ts

...rc/lib/ui/editor/formcontrol-editor.abstract.component.ts

alfa-client/libs/ui/src/lib/ui/ui.module.ts