Refactor AerodromeDropdownContainer to modern way of implementing it

[rzueger]

• Functional component with destructured props instead of a class
• useSelector replaces mapStateToProps — reads directly from the Redux store
• useDispatch replaces mapDispatchToProps — you no longer need connect() at all
• useEffect with [] replaces componentWillMount — runs once after first render. (componentWillMount actually ran before render, but for data fetching the difference is negligible and useEffect is the correct modern pattern)
• PropTypes for injected Redux props are removed since they're no longer passed from a parent — only the truly external props remain