remove hostname from simplelogin. update jslib

[kspearrin]

Type of change

• [x] Bug fix
• [ ] New feature development
• [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• [ ] Build/deploy pipeline (DevOps)
• [ ] Other

Objective

The hostname parameter for the simplelogin API should be handled automatically without user input. Remove the user input.

Update jslib.

Code changes

• generator html: Remove the hostname input from simplelogin forwarding service.

Before you submit

• [x] I have checked for linting errors (npm run lint) (required)
• [ ] I have added unit tests where it makes sense to do so (encouraged but not required)
• [ ] This change requires a documentation update (notify the documentation team)
• [ ] This change has particular deployment requirements (notify the DevOps team)