Fix dropdown items not display issue when dropdown render at bottom in android

[Mahalakshmi269]

Issue: Dropdown items not visible, when dropdown render at bottom in android.

• Dimensions API is not working as expected in the android device. Hence used 'react-native-safe-area-context' library.
• useSafeAreaFrame hook from 'react-native-safe-area-context' library, returns exact height for android device.
• So created a wrapper (ModalDropdownWrapper.js) around existing ModalDropdown component and passed 'androidWindowHeight' as a prop.

Before fix:

After fix: