Fix ocl tonemap cannot output full range

[nyanmisaka]

Changes

• Fix ocl tonemap cannot output full range

Issues

 float rgb2y(float r, float g, float b) {
     float y = r*yuv_matrix[0] + g*yuv_matrix[1] + b*yuv_matrix[2];
+#ifndef FULL_RANGE_OUT
     y = (219.0f * y + 16.0f) / 255.0f;
+#endif
     return y;
 }

[gnattu]

I've noticed this for Metal before and fixed that earlier, did not check OCL.

[nyanmisaka]

I've noticed this for Metal before and fixed that earlier, did not check OCL.

I also fixed it in CUDA in the past and forgot to add it back into OCL.
The problem was not exposed until the recent changes.