Merge branch 'fix_subpic_extraction' into 'master'

BitstreamExtractor: initialize slice map before intialization of subpictures

See merge request jvet/VVCSoftware_VTM!1624

source/App/BitstreamExtractorApp/BitstreamExtractorApp.cpp

@@ -498,6 +498,7 @@ uint32_t BitstreamExtractorApp::decode()
         }
         else
         {
+          pps->initRectSliceMap(sps);
           pps->initSubPic(*sps);
           xPrintSubPicInfo (pps);
           if (m_subPicId >= 0)