Purge approvals on multisig removal

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Purging removals was not updated (or added in the first place, not sure when/if this was changed)
• Logic deleted in execute_transaction_if_approved does not functionally change anything, just somehow was missed in v2 update and didn't affect anything

Fixes state diff at height 435908

Reference issue to close (if applicable)

Closes

Other information and links