Fix psbulk gene order #92

Job	Run time
test (example.ipynb)	2m 4s
test (bench/rna.ipynb)	3m 57s
test (omnipath/orthologs.ipynb)	1m 22s
test (spatial/rna_visium.ipynb)	1m 37s
test (omnipath/licenses.ipynb)	1m 10s
test (bulk/rna.ipynb)	1m 52s
test (scell/rna_pstime.ipynb)	2m 46s
test (scell/rna_sc.ipynb)	1m 18s
test (scell/rna_psbk.ipynb)	1m 30s
	17m 36s

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