[BUG] Vapoursynth: Interframe options mixed up for OverrideAlgo

[Selur]

I'll probably drop the names for the overwrite algorithm parameter and use the modes directly:

Rendering algorithm or "SVP shader", available values are:
    1 - sharp picture without any blending, moves pixels by motion vectors from next frame to current. Requires only backward motion vectors ("analyse.vectors: 2") so it's the fastest possible method.
    2 - like 1st but moves pixels from the nearest (in terms of time) frame so it uses both backward and forward vectors. Recommended for 2D animations.
    11 - time weighted blend of forward and backward partial motion compensations.
    13 - same as 11th but with dynamic median added. Produces minimum artifacts but with noticeable halos around moving objects.
    21 - 11th plus additional cover/uncover masking to minimize halos and improve frame edges.
    23 - 21th plus extra vectors from adjacent frames for further decreasing of halos, can be less smooth than 21th.

source: https://www.svp-team.com/wiki/Manual:SVPflow
and neither Avisynth nor Vapoursynth will have a 'none'.

Cu Selur