FIX: gimme_motifs call ignores user specified args

[kirbyziegler]

Issue: user defined arguments are not included in gimme_motifs() in motifs.py line 104

gimme_motifs(
            sample,
            args.outdir,
            params={
                "tools": args.tools,
                "analysis": args.analysis,
                "background": bg,
                "custom_background": bgfile,
                "genome": args.genome,
                "size": args.size,
            },
        )

As a result:
params = parse_denovo_params(params) in denovo.py line 571 sets parameters to default
prepare_denovo_input_bed() uses default fraction and abs_max (ignoring user-defined fraction value)

Easy fix options:

(1) set the .config/gimmemotifs/gimmemotifs.cfg file directly

OR

(2) alter gimme_motifs() in motifs.py line 104:

gimme_motifs(
            sample,
            args.outdir,
            params={
                "tools": args.tools,
                "analysis": args.analysis,
                "background": bg,
                "custom_background": bgfile,
                "genome": args.genome,
                "size": args.size,
                "fraction": args.fraction,
            },
        )