* test/lisp/progmodes/cperl-mode-tests.el: Adjust for `perl-mode`.
(cperl-test-ppss): Rename from `cperl-test-face` and change return value.
(cperl-mode-test-bug-42168): Test the `syntax-ppss` state rather than
the font-lock faces, so it works for both `perl-mode` and `cperl-mode`.