A small fix for ignored ambigous rules that reappeared in scheduler.
A small fix for ignored ambigous rules that reappeared in scheduler.

gusevfe/snakemake,pascal-git/snakemake,gusevfe/snakemake,pascal-git/snakemake,pascal-git/snakemake,pascal-git/snakemake,gusevfe/snakemake,gusevfe/snakemake