Bug 21139: (follow-up) Floating toolbars - Remove unecessary height

Bug 21139: (follow-up) Floating toolbars - Remove unecessary height

Found where QAing bug 20935, we actually want the hidden toolbar to be
the exact same height as the visible one.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 592905a4d2d41a1a7b757c48fbac8fc6f025bf9b)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 514939a8046cb82a66cfb3966a14020e846face3)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>