Fix psbulk gene order #93

Job	Run time
test (bench/rna.ipynb)	3m 13s
test (scell/rna_sc.ipynb)	1m 20s
test (scell/rna_pstime.ipynb)	1m 56s
test (omnipath/licenses.ipynb)	1m 32s
test (example.ipynb)	2m 12s
test (omnipath/orthologs.ipynb)	1m 18s
test (spatial/rna_visium.ipynb)	1m 58s
test (scell/rna_psbk.ipynb)	1m 34s
test (bulk/rna.ipynb)	2m 33s
	17m 36s

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