CarpetX: remove superfluous parens #1179

Job	Run time
download-build-test (cpu, real32, debug)	10m 53s
download-build-test (cpu, real64, debug)	10m 49s
download-build-test (cpu, real64, optimize)	14m 57s
download-build-test (cuda, real32, debug)	22m 5s
download-build-test (cuda, real64, debug)	22m 17s
download-build-test (cuda, real64, optimize)	21m 57s
download-build-test (rocm, real64, debug)	15m 35s
download-build-test (rocm, real64, optimize)	16m 19s
download-build-test (oneapi, real64, debug)	2m 18s
download-build-test (oneapi, real64, optimize)	2m 31s
	2h 19m 41s

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