[porenetwork][common] clean up in BoundaryFlux class

5 jobs for !2869 with fix/pnm-BoundaryFlux
detached
Status Name Job ID Coverage
  Trigger
manual full-dune-latest-release-clang
manual full-dune-latest-release-gcc
manual full-dune-master-gcc
manual minimal-dune-latest-release-gcc
 
  Downstream Modules
created trigger lecture