SvxBackgroundTabPage: select matching gradient entry on load, if possible
SvxBackgroundTabPage: select matching gradient entry on load, if possible

Change-Id: Ie654fc795a3f46f1ff26a1ff5adb7e8ce9091851

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core