Resolves: fdo#86222 hard-coded pixel dimensions are too high/wide

Change-Id: Ie6183a7e78b671a2d126127e4fcaa3b353d8a324
(cherry picked from commit a6db5e6a2a2ac7f92e6d15669693d991c9460998)

Related: fdo#86222 rework area graphic fill page for better height

(cherry picked from commit d7402886d42035873e7d7cb3a30582e9001217bf)

Conflicts:
	cui/uiconfig/ui/areatabpage.ui

Change-Id: Ibd8e68a5a2ebd6ac2a829004c8918f9a449ef5d7
Reviewed-on: https://gerrit.libreoffice.org/12461
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>