resolve invalid calculation

[0oM4R]

Description

the calculate function was get invoked before the validation process, so it deals with the old value of isValidInpot

Changes

• change the approach of invoking calculate function
• cleanup some lines

Related Issues

• https://github.com/threefoldtech/tfgrid_dashboard/issues/539

  Checklist

• [ ] Tests included

• [x] Build pass

• [ ] Documentation

• [x] Code format and docstrings