CarpetX: Correct fallback conditions for ENO stencils #1028

Job	Run time
download-build-test (cpu, real32, debug)	8m 33s
download-build-test (cpu, real64, debug)	8m 29s
download-build-test (cpu, real64, optimize)	12m 31s
download-build-test (cuda, real32, debug)	19m 25s
download-build-test (cuda, real64, debug)	19m 30s
download-build-test (cuda, real64, optimize)	19m 6s
download-build-test (rocm, real64, debug)	15m 28s
download-build-test (rocm, real64, optimize)	15m 52s
	1h 58m 54s

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