tests: give more room for slowness in test-run-tests.t
The test expected any run-test.py run to end in less than 10 seconds. On slower
loaded CI machine, this gets slower than that. We give a bit more room to the
regexp.
local test passedaddgroupcopy test passedclone test passedlowlevelcopy test passedslicing test passedissnapshot test passedfindsnapshot test passed