tests: Update seh_unhandled's regex.
tests: Update seh_unhandled's regex.

https://github.com/jrfonseca/drmingw/pull/50#issuecomment-646631544

jrfonseca/drmingw,jrfonseca/drmingw,jrfonseca/drmingw,jrfonseca/drmingw