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
  • [x] None

• Consensus

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