crypto: fix generateKeyPair type checks

Change saltLength, divisorLength, primeLength and generator
checks in generateKeyPair to int32 from uint32, to align
with c++ code.

fixes: https://github.com/nodejs/node/issues/38358

PR-URL: https://github.com/nodejs/node/pull/38364
Fixes: https://github.com/nodejs/node/issues/38358


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>