Paginated Tasks: Remove frontend filtering

Currently `FilterList` filters the list of tasks stored in redux that was retrieved from the backend. Since the backend now handles filtering and sorting, we no longer have to rely on this being a client-side, in-memory operation. Because of this, the design of the Tasks list and the filtering functionality can be simplified greatly. `FilterList` can go away from `TasksList` and instead turn into an input box that and dropdown that solely collect input and send it to the backend, rather than actually filtering and sorting.