Do not clobber the Total line in mgr:mem report #133

Job	Run time
functionality-tests	17m 13s
source-maintenance-tests	2m 49s
CodeQL-tests	36m 44s
build-tests(ubuntu-22.04,gcc,default)	5m 46s
build-tests(ubuntu-22.04,gcc,minimal)	4m 25s
build-tests(ubuntu-22.04,gcc,maximus)	5m 48s
build-tests(ubuntu-22.04,clang,default)	6m 10s
build-tests(ubuntu-22.04,clang,minimal)	4m 58s
build-tests(ubuntu-22.04,clang,maximus)	6m 59s
	1h 30m 52s

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