testrunner: make `-j100 --runs-per-test=100 test-foo.t` use 100 jobs
It would use only 1 job since
1039404c5e1d (run-tests: print number of
tests and parallel process count, 2018-10-13), but I'm pretty sure
that was unintentional.
Differential Revision: https://phab.mercurial-scm.org/D5557
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