cudev: fix 1D error introduced in PR 3378

[cudawarped]

This fixes issue #3412 returning incorrect results for single GpuMat's with a single row, which was a result of an error in #3378.

Unfortunatley because GpuMat's with a single row or column are allocated with cudaMalloc and not cudaMallocPitch and 2D texture objects require pitched memory this PR introduces extra staging memory, when the row/col dimension is 1. This is a quick fix for the issue which only introduces extra overhead for single dimension GpuMat's who's use should not be that common.

A "better" fix would be to rework the TexturePtr class so that

__device__ __forceinline__ R operator ()(index_type y, index_type x) const;

staticly dispatches a call to tex1Dfetch when either x or y is 1, but this will be a more significant change.

Dependant on opencv/opencv#23126

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