Fix snpeffdb output to not contain broken symlinks #11492

Job	Run time
Setup cache and determine changed repositories (3.7)	2m 14s
Lint tool-list (3.7)	1m 10s
Lint R scripts (ubuntu-20.04, release)	1m 49s
Check file sizes	43s
Lint Python scripts (3.7)	29s
Test tools (0, 3.7)	5m 27s
Test tools (1, 3.7)	2m 56s
Test tools (2, 3.7)	5m 16s
Test tools (3, 3.7)	4m 20s
Combine chunked test results (3.7)	28s
Check workflow success	1s
Deploy	0s
Report deploy status	0s
	24m 53s

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