Ensure we test fetching encoder/decoder/store loader with a query string

Ensure we test fetching encoder/decoder/store loader with a query string

Although we had a test for fetching an encoder/decoder/store loader it
did not use a query string. The issue highlighted by #17456 only occurs
if a query string is used.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17459)