Fix register overload in CUDA spacepoint formation #730
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PR #719 refactored the spacepoint formation to use the detray detector. While this was and remains a good idea, the introduction of the detray detector massively increases the register use of the kernel, to the point that I was seeing "too many resources requested for launch" errors. This commit modifies the kernel to specify appropriate launch bounds, allowing the compiler to better tune the register usage and resolve the bug.