A couple rendering fixes for jogl

Always get a modern context, never own the context
3 jobs for jogl_fixes
latest
Status Job ID Name Coverage
  External
passed cdash-buildbot

passed ghostflow-branch-check-master

passed vtk@master-eeloo-linux-shared-release+adios2+extdeps+java+mpi+python3+qt+tbb+vtkm

00:15:05