application-controller: Enable to toggle find bar

To toggle the widget, shortcuts, Ctrl+F for turning it on and
Ctrl+Shift+F for turning it off, are available.
5 jobs for toggle-searchbar in 29 minutes and 58 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #299815
fedora

00:03:50

passed #299816
ubuntu

00:08:23

 
  Test
passed #299817
flatpak

00:21:06

 
  Deploy
passed #299818
review

00:00:27

manual #299819
allowed to fail manual
stop_review