Fixes bug with treasury getter of slashed funds and sets fee to 5% for slashing

[ckartik]

Describe your changes

• Previously, we were setting the Fee allocated to the treasury due to slashing events to zero, before pulling the funds. We update this to ensure we keep a temporary variable that stores the value meant for the treasury during retrieval. We also set the slashing percentage reward for the protocol to 5%.

Checklist before requesting a review

• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have tested this code by deploying the infrastructure and ensuring that commitments are being settled

[shaspitz]

The above change will be n/a with #293, but we can use this change

[ckartik]

Duplicate given shawns other changes.