Do not clobber the Total line in mgr:mem report #118

Job	Run time
CodeQL-tests	25m 46s
functionality-tests	17m 25s
build-tests(ubuntu-22.04,gcc,default)	13m 40s
source-maintenance-tests	2m 59s
build-tests(ubuntu-22.04,gcc,minimal)	7m 3s
build-tests(ubuntu-22.04,gcc,maximus)	14m 38s
build-tests(ubuntu-22.04,clang,default)	14m 43s
build-tests(ubuntu-22.04,clang,minimal)	8m 19s
build-tests(ubuntu-22.04,clang,maximus)	17m 12s
	2h 1m 45s

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