[gtk] testsuite: Remove box packing css node tests

[Matthias Clasen <matthiasc src gnome org>]

commit c47abb5f6894c6bd43c5db40d9584265f0a9320b
Author: Timm Bäder <mail baedert org>
Date:   Fri Dec 28 16:53:17 2018 +0100

    testsuite: Remove box packing css node tests
    
    Testing the correct css order for mixed pack-start/pack-end cases
    doesn't make sense if boxes don't have a notion of pack-type anymore.

 testsuite/css/nodes/box-packing.ltr.nodes |  5 -----
 testsuite/css/nodes/box-packing.ltr.ui    | 32 -------------------------------
 testsuite/css/nodes/box-packing.rtl.nodes |  5 -----
 testsuite/css/nodes/box-packing.rtl.ui    | 32 -------------------------------
 4 files changed, 74 deletions(-)