bgsegm: fix test broken by RNG change #3759
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Resolves #3756
Test "VIDEO_BGSUBGMG.accuracy" generates random image with type 0-6 and channels 1-4, but algorithm only supports CV_8U, CV_16U, CV_32F and 1, 3, 4 channels. Test had failed due to RNG change the main repository, I've quick-fixed the test, but ideally the whole test must be rewritten because it actually checks just a single random image type.