Fix test failures of test/lisp/auth-source-pass-tests.el

Failures introduced by recent "Make auth-source-pass-search understand
port lists", commit 92fda5a7.

* lisp/auth-source-pass.el
(auth-source-pass--generate-entry-suffixes): Fix test failures.
1 job for master in 60 minutes and 42 seconds (queued for 2 seconds)
Status Job ID Name Coverage
failed #4340


Name Stage Failure
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:319: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:294: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
make[1]: *** [check-expensive] Error 2
make: *** [check-expensive] Error 2
Makefile:959: recipe for target 'check-expensive' failed
ERROR: Job failed: exit code 1