Fix pipeline stats in HPPTerrainTessellation

[yknishidate]

Description

Fixed pipeline stats in the hpp_terrain_tessellation sample.

The bug was caused by copying result.value when the query result was NotReady. The original C sample (vkGetQueryPoolResults) also generated NotReady, but since the result value was not written to the output pointer, the same problem as the HPP version did not occur.

The bug can also be fixed by setting the VK_QUERY_RESULT_WAIT_BIT flag, but to match the behavior of the original C sample, I modified it to only read the value if the result was Success.

• This PR has only been tested on Windows.
• Fixes HPP terrain tessellation sample reports wrong statistics #674

General Checklist:

Please ensure the following points are checked:

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[asuessenbach]

Great catch!

Thanks for this fix.

[SaschaWillems]

Thank you very much. Explains (and fixes) the issue I had with the HPP variant of this sample :)