Fix `-offtargetDB` option for cached FASTA files #197

Job	Run time
Setup cache and determine changed repositories (3.7)	4m 50s
Lint tool-list (3.7)	34s
Lint R scripts	0s
Check file sizes	0s
Lint Python scripts	0s
Test tools (0, 3.7)	36m 15s
Combine chunked test results (3.7)	36s
Deploy (3.7)	51s
Check workflow success	0s
Report deploy status	0s
	43m 6s

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