Bug 38222: (follow-up) Reset overflow property of modal-body to prevent clipping...

Bug 38222: (follow-up) Reset overflow property of modal-body to prevent clipping of combobox options instead of position: fixed

Also remove the inlined styles on the unordered list. Bootstrap's dropdown handles all of this.

Sponsored-by: Büchereizentrale Schleswig-Holstein <https://www.bz-sh.de/>
Signed-off-by: LEBSimonsen <simonsen@bz-sh.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>