simplify SwXCell UNO boilerplate
simplify SwXCell UNO boilerplate

Change-Id: Ib0057ac18ff6d5db7cf3d19eace5b602778450d8

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