Only consolidate per-block rewards after moving to static rewards

[Bushstar]

Summary

• Consolidating all rewards is no longer safe to do after the move to static rewards as rewards now have a higher precision. Consensus may generate a higher reward due to sub-satoshi amounts than more frequent intermediate running of consolidate rewards. This PR updates the -consolidatereards flag to only consolidate the per-block rewards.
• Flush the DB after flushing the view to make sure that changes are all present in the DB.

Implications

• Storage

  • Database reindex required
  • Database reindex optional
  • Database reindex not required
  • None

• Consensus

  • Network upgrade required
  • Includes backward compatible changes
  • Includes consensus workarounds
  • Includes consensus refactors
  • None