testrunner: fix updating of .testtimes file We attempt to write the 5 most recent test timings to a file called .testtimes, but we read previous results from a file called .testtimes- (including the hyphen), so we ended up no more than a single time per test. Differential Revision: https://phab.mercurial-scm.org/D1961

--- a/tests/test-run-tests.t	Wed Jan 31 23:12:45 2018 -0800
+++ b/tests/test-run-tests.t	Wed Jan 31 22:20:59 2018 -0800
@@ -374,6 +374,7 @@
   </testsuite>
 
   $ cat .testtimes
+  test-empty.t * (glob)
   test-failure-unicode.t * (glob)
   test-failure.t * (glob)
   test-success.t * (glob)