Refactor "currentTicket" recoil state logic

[victorzheng02]

Currently currentTicket and allTickets are not connected. After we make an updated, we call setAllTickets, we should expect this to update the currentTicket as well. Refactor currentTicket to depend on setAllTickets, or find a different way to store this state (we can pull the current ticket from the location.pathname, and filter to find it from the list of allTickets).