LiftScreen: Validation errors not shown when using Record

[justwrote]

As seen in http://groups.google.com/group/liftweb/browse_thread/thread/3ad3a424242bcc80/c981ef966284cf40

Validation errors are not shown next to the fields if you are using Record.

[dpp]

(In [[r:02754091c17e5be1fef4ac3e5df8f1aab9c5ad48]]) fixed #949. Closes #949. Record correctly uses uniqueFieldId and will work with Screen

Branch: master

[github-importer]

Imported from Assembla: http://www.assembla.com/spaces/liftweb/tickets/949