Improve diaspeed icons (elementary)

Change-Id: I71f3e9acadb97512c39a44c929b63f81eea4e944
Reviewed-on: https://gerrit.libreoffice.org/63503Reviewed-by: Rizal Muttaqin <riz_17_oke@yahoo.co.id>
Tested-by: Rizal Muttaqin <riz_17_oke@yahoo.co.id>