saml2/sp/initSSO: Fix use of isPassive and ForceAuthn from metadata.
saml2/sp/initSSO: Fix use of isPassive and ForceAuthn from metadata.

newmen/saml2,sitya/saml2,madmatt/saml2,ArtemTeleshev/php-saml2,sgomez/saml2,cb8/saml2,simplesamlphp/saml2