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.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown