ubuntu: fix gromacs cmake dir #568

Job	Run time
CI (fedora, gmxpkg)	25m 46s
CI (fedora, rawhide, TAG=rawhide,PYTHON=python3.12, true)	2m 51s
CI (ubuntu, latest)	1m 55s
CI (ubuntu, intel, TAG=22.04,INTEL=yes, true)	5m 0s
CI (ubuntu, rolling, TAG=rolling)	2m 1s
CI (ubuntu, devel, TAG=devel, true)	2m 11s
CI (opensuse, latest, true)	2m 11s
CI (fedora, latest, GMX_BRANCH=release-2019,GMX_DOUBLE=ON)	27m 36s
CI (fedora, gmx2019, GMX_BRANCH=release-2019)	27m 4s
CI (fedora, gmx2023_d, GMX_BRANCH=release-2023,GMX_DOUBLE=ON)	33m 24s
CI (fedora, gmx2023, GMX_BRANCH=release-2023)	32m 58s
CI (fedora, gmx9999_d, GMX_BRANCH=main,GMX_DOUBLE=ON, true)	32m 39s
CI (fedora, gmx9999, GMX_BRANCH=main, true)	35m 3s
CI (fedora, nogmx, GMX_BRANCH=none)	23m 24s
CI (fedora, intel, TAG=38,INTEL=yes,PYTHON=python3.11, true)	33m 51s
CI (actions, latest)	49s
CI (format, latest)	48s
	4h 49m 31s

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