fdo#60703: MSDraw filter: fix import of flags
fdo#60703: MSDraw filter: fix import of flags

DffPropSet::IsHardAttribute needs to handle flag properties specially
(regression from 44cfc7cb6533d827fd2d6e586d92c61d7d7f7a70)

Change-Id: If5c6b9cfac58a787527cd132f7fc80d392b8e677

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