test: show more profile lines in test-profile.t

This shows that we don't output anything after the first line and demonstrate
issue6003.

Differential Revision: https://phab.mercurial-scm.org/D5171

tests/test-profile.t

@@ -87,7 +87,7 statistical profiler works
 Various statprof formatters work
 
   $ hg --profile --config profiling.statformat=byline sleep 2>../out
-  $ head -n 1 ../out
+  $ head -n 3 ../out
     %   cumulative      self          
   $ cat ../out | statprofran