fdo#86622 sidebar: Distorted icons in Graphic section

Similar to:
36f275cb0f19d11151abf85f3c191a2736bd73da
92a0793265c66d289828c0193097b14b7e7e2d0f

Regression of:
eaa89db886ba49472e22d77cea957a08c1113cd0

Change-Id: I98893989fff9f9893f6b3b52b24a43676fe7c6f7