Remove view snapshot from RPC call

[Bushstar]

Summary

• When the PR for future swap limitation was created the RPC call used the view snapshot which has since been removed until a better solution is implemented. This PR removes the usage of the view snapshot from the future swap limitation RPC call.

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