Use the Working Directory When Looking Up gmon.out

The launch configuration specifies that the gmon.out will be at the
working directory, so it does not make sense to look for it at the
project directory.

Change-Id: I5172827632ef884a27953eaf9ce15373ed5a1fb1
Signed-off-by: David E. Narváez <david.narvaez@computer.org>
Reviewed-on: https://git.eclipse.org/r/34756
Tested-by: Hudson CI
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>
Tested-by: Jeff Johnston <jjohnstn@redhat.com>