Revert "ztest: Fix test statistics reporting"

This reverts commit 2af5ac8f.

Failures are not being captured correctly now:

 - PASS - [test_c_lib.test_strtoul] duration = 0.001 seconds
 - PASS - [test_c_lib.test_strxspn] duration = 0.001 seconds
 - FAIL - [test_c_lib.test_that_fails] duration = 0.002 seconds
 - PASS - [test_c_lib.test_time] duration = 0.001 seconds
 - PASS - [test_c_lib.test_tolower_toupper] duration = 0.001 seconds

------ TESTSUITE SUMMARY END ------

===================================================================
PROJECT EXECUTION SUCCESSFUL

Signed-off-by: Anas Nashif <anas.nashif@intel.com>