build: only burn or mint

[Schlagonia]

Description

Most reports will burn shares twice and mint once causing unnecesary gas usage.

This will calculate the end state of shares first and then only burn OR mint depending on the amount needed to change.

Fixes # (issue)

Checklist

• [x] I have run vyper and solidity linting
• [x] I have run the tests on my machine
• [x] I have followed commitlint guidelines
• [x] I have rebased my changes to the latest version of the main branch