toolkit: don't let ToolkitWorkerFunction join its own thread
toolkit: don't let ToolkitWorkerFunction join its own thread

Change-Id: I6694bf83e1e5ba6563d399e454442ce3574e8d26

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