findbar: disable up/down buttons by default, there is no text to search
findbar: disable up/down buttons by default, there is no text to search

Change-Id: I67550f0b40e1c0d294bf8837a2e6ad3bb30dac8a

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