[dune-pdelab] Patch: Get rid of warnings

[Christoph Grüninger]

Hi PDELab,
that fixes two warnings in PDELab. The fixed deprecation warning fixes
make check if PDELab is used with Dune's master.

Hope this patch gets applied together with the one from last week,
Christoph

-- 
... as Sir Cyril Hinshelwood has observed ...fluid dynamicists
were divided into hydraulic engineers who observed things that
could not be explained and mathematicians who explained things
that could not be observed.                 -- James Lighthill
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