DFTTest Rename sstring parameter and change type to float array.

I got this error:

  File "\site-packages\Oyster.py", line 438, in Deblocking
    lowpass, color, matrix)
  File "\site-packages\Oyster.py", line 208, in deblocking
    ref                  = core.FreqMerge(cleansed, ref, block_size // 2 * 2 + 1, lowpass)
  File "\site-packages\Oyster.py", line 44, in FreqMerge
    hif                  = self.MakeDiff(hi, self.DFTTest(hi, sbsize=sbsize, sstring=sstring, **dfttest_args))
  File "src\cython\vapoursynth.pyx", line 1825, in vapoursynth.Function.__call__
vapoursynth.Error: DFTTest: Function does not take argument(s) named sstring

https://github.com/HomeOfVapourSynthEvolution/VapourSynth-DFTTest/commit/8d85dd8c8001c1d6cd470209b84b3e82453ecf10

IFeelBloated / Oyster

DFTTest Rename sstring parameter and change type to float array. #2