Miner: Check loan tokens are not locked before adding dToken restart

[Bushstar]

Summary

• dToken restart will fail if any loan tokens are locked, this will result in a block hash mismatch as the miner will have added the expected token creation TXs and EVM TXs for the restart. This PR adds code to the miner to skip adding these TXs if there are locked loan tokens avoiding creating invalid blocks.

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