uptime: use "0 users" instead of "0 user" #8772

Job	Run time
Build the fuzzers	1m 58s
Fuzz (fuzz_sort, false)	2m 50s
Fuzz (fuzz_date, false)	2m 12s
Fuzz (fuzz_cut, false)	1m 35s
Fuzz (fuzz_expr, true)	2m 44s
Fuzz (fuzz_test, true)	2m 50s
Fuzz (fuzz_parse_time, true)	2m 4s
Fuzz (fuzz_cksum, false)	1m 50s
Fuzz (fuzz_env, false)	1m 43s
Fuzz (fuzz_echo, true)	2m 48s
Fuzz (fuzz_parse_size, true)	2m 3s
Fuzz (fuzz_printf, true)	2m 48s
Fuzz (fuzz_wc, false)	1m 40s
Fuzz (fuzz_seq, false)	1m 47s
Fuzz (fuzz_split, false)	2m 9s
Fuzz (fuzz_seq_parse_number, true)	2m 42s
Fuzz (fuzz_tr, false)	1m 58s
Fuzz (fuzz_parse_glob, true)	2m 41s
Fuzzing Summary	6s
	40m 28s

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