Reset title bar icon to left in CSD
This icon was moved to the left in XfceTitledDialog after xfce/libxfce4ui!103 (merged), so 8ddfa264 should be reverted.
This icon was moved to the left in XfceTitledDialog after xfce/libxfce4ui!103 (merged), so 8ddfa264 should be reverted.