Remove unused -stand_call_conf option
Remove unused -stand_call_conf option

According to
https://software.broadinstitute.org/gatk/documentation/tooldocs/current/org_broadinstitute_gatk_tools_walkers_haplotypecaller_HaplotypeCaller.php
the option is set to 0 anyway when --emitRefConfidence GVCF is used:

> When running in `-ERC GVCF` or `-ERC BP_RESOLUTION` modes, the
> emitting and calling confidence thresholds are automatically set
> to 0. This cannot be overridden by the command line.

marcelm/CAW,marcelm/CAW,szilvajuhos/CAW,marcelm/CAW,szilvajuhos/CAW,szilvajuhos/CAW