PVIDEO handling of NV_PVIDEO_SIZE_IN is incorrect

[abaire]

Bug Description

The current implementation creates a scaling effect and does not reproduce the clamping seen on hardware when the in size is less than the out size (and the DsDx/DtDy ratios are unity).

Test: https://github.com/abaire/nxdk_pgraph_tests/blob/c047da43bb6b6d8b011310204cae6eb6e77b2c5a/src/tests/pvideo_tests.cpp#L1129

Expected Behavior

On hardware, this test results in advancing diagonal lines with the last column/row of pixels being clamped to the edge of the output region.

HW results
https://youtube.com/clip/Ugkx7TJWlx74QUMW8rT5n45s_xyfQ2MT1SBh?si=PyXNE5z47jELhhwO

xemu Version

N/A affects all xemu versions

System Information

N/A affects all platforms

Additional Context

No response