tests: allow for 100% of profiled time in sleep in test-profile.t

I'm getting an annoying failure in this test on our builder, and I
*think* what's happening is that the profiler is taking _just_ long
enough to start that we're spending 100% of the profiled time in the
sleep function, which was causing the leading space to not be printed
since the 100 was in the first column of output.

Differential Revision: https://phab.mercurial-scm.org/D5272

tests/test-profile.t

@@ -90,7 +90,7 b' Various statprof formatters work'
   $ head -n 3 ../out
     %   cumulative      self          
    time    seconds   seconds  name    
-   * sleepext.py:*:sleep (glob)
+  * sleepext.py:*:sleep (glob)
   $ cat ../out | statprofran
 
   $ hg --profile --config profiling.statformat=bymethod sleep 2>../out