fix s/(.)/die/e

fix s/(.)/die/e

Commit 6502e08109cd003b2cdf39bc94ef35e52203240b introduced copying just
the part of the regex string that were needed; but piggy-backing on that
commit was a temporary change I made that I forgot to undo, which - it
turns out - causes SEGVs and similar when the replacement part of a
substitution dies.

This commits reverts that change.

Spotted as
    Bleadperl v5.17.3-255-g6502e08 breaks GAAS/URI-1.60.tar.gz
(not assigned an RT ticket number yet)