Math: Add new colors in the Sidebar

Regine add new colors to Math in fe5840aab17e366749c373e4f8683e06e40b4b05 and
this commit just take those new colors and show in the Math Sidebar.

Change-Id: Idd67cf4a04b2855970b115aac8d15d6506f73298
Reviewed-on: https://gerrit.libreoffice.org/12239
Reviewed-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>
Tested-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>