Clean up duplicate db definitions in blipHandler/blipSyncContext

blipHandler defines a db property on its struct, but also embeds blipSyncContext which has its own db property. The majority of references access the db through blipHandler (and so will be using that version), but there are a few places the db on the context is being explicitly references - within Logf, a few stats references, and the DeltaSyncEnabled check.

This should be cleaned up to use a single db reference, as the outer database reference gets refreshed when the user is reloaded, but the blipSyncContext instance isn't.