Finance Fixes - Deny own reimbursement request

[ryanhowe28]

Observed Behavior

Right now you need specific permissions to deny a reimbursement request

Expected Behavior

We want users to be able to deny their own reimbursement requests, in case they made a mistake or something

Steps to Reproduce

1. Make a reimbursement request with a user who does not have perms to deny
2. try and deny your own request

Screenshots (as needed)

No response

[RChandler234]

You should also update the corresponding frontend checks