SIFR: fix issues color icons, control code icon, and large underline icon

Change-Id: Id2c795b7bdcf00a67ddacb2ea076967fbbefcb0a
Reviewed-on: https://gerrit.libreoffice.org/12053
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>