Bug fix: incorrect flag when reading dust properties #131

Job	Run time
build+test (linux, gfortran, openmp=yes, release=yes)	9m 51s
build+test (linux, gfortran, openmp=yes, release=no)	8m 12s
build+test (linux, gfortran, openmp=no, release=yes)	13m 3s
build+test (linux, gfortran, openmp=no, release=no)	15m 10s
build+test (linux, ifort, openmp=yes, release=yes)	18m 40s
build+test (linux, ifort, openmp=yes, release=no)	11m 52s
build+test (linux, ifort, openmp=no, release=yes)	27m 15s
build+test (linux, ifort, openmp=no, release=no)	18m 30s
build+test (macos, gfortran, openmp=yes, release=yes)	10m 43s
build+test (macos, gfortran, openmp=yes, release=no)	9m 49s
build+test (macos, gfortran, openmp=no, release=yes)	19m 24s
build+test (macos, gfortran, openmp=no, release=no)	16m 32s
build+test (macos, ifort, openmp=yes, release=yes)	14m 54s
build+test (macos, ifort, openmp=yes, release=no)	9m 27s
build+test (macos, ifort, openmp=no, release=yes)	15m 25s
build+test (macos, ifort, openmp=no, release=no)	14m 49s
benchmark (gfortran)	13m 53s
benchmark (ifort)	6m 52s
release	0s
	4h 14m 21s

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