Search field missing in mobile view  #1450

Describe the bug
There is no Search field in the mobile version since the ui update.

Steps To Reproduce
Steps to reproduce the behavior:

1. Clicking on the menu with the three dots in the top right.
2. In the menu click on search.
   => there is no text field

Screenshot

Expected behavior
There should be a text field to enter a search query.

Your Configuration (please complete the following information):
Using bookstack test instance from https://demo.bookstackapp.com