oox::drawingml::Shape: fix "lock underflow in SvxShape" assertions
oox::drawingml::Shape: fix "lock underflow in SvxShape" assertions

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