Resolves: fdo#74985 forward/back buttons too large

Change-Id: Ibed2216d2ca0a6dce48c0a6ef276f4a4f4d53219
(cherry picked from commit 7d68f0fa201ce1b29f62ecbaea25890148591da7)
Reviewed-on: https://gerrit.libreoffice.org/8543
Tested-by: Kohei Yoshida <libreoffice@kohei.us>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>