Fix beacon renewal for scraper consenus window
Fix beacon renewal for scraper consenus window

An issue observed on testnet resulted in exclusion of a CPID from a
superblock when that wallet automatically renewed its beacon during
the superblock formation period. The new advertisement replaced the
beacon with a timestamp later than the beacon consensus window used
by the scrapers to create a list of CPIDs to include for statistics
processing.

This change disables beacon renewal immediately prior to superblock
formation to avoid the condition above.

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