Fix missing import identified by pylint.
Fix missing import identified by pylint.

************* Module app.soc.logic.models.user
E0602: 99:Logic.agreesToSiteToS: Undefined variable 'db'

Patch by: Todd Larsen
Review by: to-be-reviewed

--HG--
extra : convert_revision : svn%3A32761e7d-7263-4528-b7be-7235b26367ec/trunk%401453

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