Fixed test message.

If the prove command is executed in recursive mode, the path notation of the performed test will change and it will become an error.

 $ prove --blib -r

 ./t/Modern/Tester2.t ...................... 1/?
 #   Failed test 'Failure diag checking'
 #   at ./t/Modern/Tester2.t line 50.
 # (diag 2) message => '
 #   Failed test 'Lets name this test!'
 #   at ./t/Modern/Tester2.t line 45.
 # ' does not match (?^s:Failed test 'Lets name this test!'.*at t/Modern/Tes
 # Looks like you failed 1 test of 23.