fix: spent asset lock estimated fees, and misc

[QuantumExplorer]

Issue being fixed or feature implemented

Small update to estimated fees of spent asset locks, and misc total credits in system

What was done?

How Has This Been Tested?

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[shumkov]

Need more information in the PR description. I hope you know what you are doing. utACK