cudaimgproc: remove incorrectly added NppStreamHandler from cv::cuda:evenLevels

[cudawarped]

In #3803 the NppStreamHandler was added for the nppiEvenLevelsHost_32s due to the documentation having a streaming version (_Ctx see https://docs.nvidia.com/cuda/archive/11.0/npp/group__image__histogrameven.html#ga1586db7ec07d9a7b5929b981e99676e0). I have since found out that this is a host-only function and the header for the streaming version will be removed in the next version of CUDA so unnecessary delay from the call to NppStreamHandler can be removed.

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