Don't write to the globals ossl_property_true and ossl_property_false

Don't write to the globals ossl_property_true and ossl_property_false

These global variables were previously overwritten with the same value
every time we created a new OSSL_LIB_CTX. Instead we preinitialise them
with the correct values, and then confirm that settings for each
OSSL_LIB_CTX agree with the preinitialised values.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16980)