west native_gdb runner: Fix to use exe instead of elf

The runnable output from the build system is the
exe file. In native_posix the elf happend to also be
runnable, but this is not the case in general,
and not for native_sim or the nrf5*bsim boards.

So lets use the exe instead.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
1 file changed