colmap2nerf: fix detectron category path resolution #574

Job	Run time
Build on linux systems (ubuntu-22.04, 11.7, 86, 3.11)	17m 42s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 86, 3.11, RTX-3000-and-4000)	25m 29s
Build on linux systems (ubuntu-22.04, 11.7, 75, 3.10)	12m 53s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 75, 3.10, RTX-2000)	26m 33s
Build on linux systems (ubuntu-22.04, 11.7, 70, 3.9)	14m 57s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 70, 3.9)	26m 55s
Build on linux systems (ubuntu-22.04, 11.7, 61, 3.8)	10m 47s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 61, 3.8, GTX-1000)	21m 24s
Build on linux systems (ubuntu-22.04, 11.7, 53, 3.7)	16m 35s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 53, 3.7, -DNGP_BUILD_WITH_GUI=OFF ...	24m 53s
Build on linux systems (ubuntu-22.04, 11.7, 37, 3.7, -DNGP_BUILD_WITH_GUI=OFF -DNGP_BUILD_WITH_VU...	13m 46s
Build on Windows (windows-2019, Visual Studio 16 2019, 11.5.1, 37, 3.7)	25m 18s
Update continuous development release	49s
	3h 58m 1s

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