fdo#47951 flat text table: update m_nRowPos when moving by bookmark
fdo#47951 flat text table: update m_nRowPos when moving by bookmark

Change-Id: Iac154020b4b6309f92b1f68fa5bf79611dfcc91b

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