Remove duplicate forcefulness

Signed-off-by: Rob Gallagher <rgallagher@pivotallabs.com>
Expose metadataTrustCheck SAML property in login.yml
- Defaults to true

[#70095706] https://www.pivotaltracker.com/story/show/70095706

Signed-off-by: Rob Gallagher <rgallagher@pivotallabs.com>