inspector: break in eval script

Fixes: https://github.com/nodejs/node/issues/14577
PR-URL: https://github.com/nodejs/node/pull/14581


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>