blockforest: autofix modernize-loop-convert

src/blockforest/AABBRefinementSelection.h

src/blockforest/Block.h

src/blockforest/BlockForest.cpp

src/blockforest/BlockForest.h

src/blockforest/BlockForestEvaluation.cpp

src/blockforest/BlockReconstruction.h

src/blockforest/GlobalLoadBalancing.h

src/blockforest/Initialization.cpp

src/blockforest/PhantomBlock.h

src/blockforest/PhantomBlockForest.cpp

src/blockforest/SetupBlock.cpp

src/blockforest/SetupBlock.h

src/blockforest/SetupBlockForest.cpp

src/blockforest/SetupBlockForest.h

src/blockforest/communication/DirectionBasedReduceScheme.h

src/blockforest/communication/UniformBufferedScheme.h

src/blockforest/loadbalancing/Cartesian.cpp

src/blockforest/loadbalancing/DynamicCurve.h

src/blockforest/loadbalancing/DynamicDiffusive.h

src/blockforest/loadbalancing/DynamicParMetis.cpp