avfilter/vf_scale_cuda: Fix incorrect scaling of > 8bit content

When i converted the filter to use texture objects instead of
texture references, I incorrect dropped the `pixel_size` scaling
factor when setting `pitchInBytes`. `src_pitch` is in pixels and
so must be scaled up.

libavfilter/vf_scale_cuda.c

@@ -357,7 +357,7 @@ static int call_resize_kernel(AVFilterContext *ctx, CUfunction func, int channel
         .res.pitch2D.numChannels = channels,
         .res.pitch2D.width = src_width,
         .res.pitch2D.height = src_height,
-        .res.pitch2D.pitchInBytes = src_pitch,
+        .res.pitch2D.pitchInBytes = src_pitch * pixel_size,
         .res.pitch2D.devPtr = (CUdeviceptr)src_dptr,
     };