Revert "check vcf-annotate filter file is readable"
Revert "check vcf-annotate filter file is readable"

This reverts commit 9b904c17b1339d59bcf5a24969ce6a5029b56ed9.
Backout vcf-annotate -f param check, as this does  not need to be a file

wtsi-hgi/vr-pipe,wtsi-hgi/vr-pipe