Revert the unintentional part of the gtk3 theme
Revert the unintentional part of the gtk3 theme

Unintentionally commit 529e929ca9a266854a3c483bc27bb76f959d8c64
touched as well the gtk2 theme. This reverts that change.

ceibal-tatu/sugar-artwork,samdroid-apps/sugar-artwork,ceibal-tatu/sugar-artwork,samdroid-apps/sugar-artwork,sugarlabs/sugar-artwork,sugarlabs/sugar-artwork,godiard/sugar-artwork,gusDuarte/sugar-artwork,gusDuarte/sugar-artwork,tchx84/debian-pkg-sugar-artwork,ceibal-tatu/sugar-artwork,i5o/sugar-artwork,godiard/sugar-artwork,i5o/sugar-artwork,gusDuarte/sugar-artwork,tchx84/debian-pkg-sugar-artwork,i5o/sugar-artwork,gusDuarte/sugar-artwork,samdroid-apps/sugar-artwork,godiard/sugar-artwork,tchx84/debian-pkg-sugar-artwork,sugarlabs/sugar-artwork