Deoldify Vapoursynth filter

[Selur]

Hybrid, like the code:

if enable_refmerge:
        if ref_weight is None:
            ref_weight = refmerge_weight[ref_merge]
        if ref_thresh is None:
            ref_thresh = 0.1
        clip_sc = SceneDetect(clip, threshold=ref_thresh)
        if method in (1, 2):
            clip_sc = SceneDetectFromDir(clip_sc, sc_framedir=sc_framedir, merge_ref_frame=True,
                                         ref_frame_ext=(method == 2))
    else:
        ref_weight = 1.0
        clip_sc = None

when 'Ref merge' switches to 'no' Hybrid sets 'Threshold' to 1.
Hybrid starts out with 'threshold 0.1' due to:

def HAVC_main(clip: vs.VideoNode, Preset: str = 'Fast', VideoTune: str = 'Stable', ColorFix: str = 'Violet/Red',
              ColorTune: str = 'Light', ColorMap: str = 'None', EnableDeepEx: bool = False, DeepExMethod: int = 0,
              DeepExPreset: str = 'Fast', DeepExRefMerge: int = 0, ScFrameDir: str = None, ScThreshold: float = 0.1,
              ScMinFreq: int = 0, DeepExModel: int = 0,
              enable_fp16: bool = True)