WYSIWYG: ckeditor auch für unsichtbare Textfelder initialisieren

This can be simply achieved by adding return before replaceTextarea(textarea); in https://gitlab.studip.de/studip/studip/-/blob/4b160476327ecb893c08ce4deb29ce1180f6e0ef/resources/assets/javascripts/lib/wysiwyg.js#L37

Currently it is not possible to wait for the wysiwyg to be loaded and the only other option is to check periodically if it is done. This is especially a problem since Stud.IP 5.3, where the the internals of wysiwyg.js changed.