Support landscape with SafeArea

lib/flutter_datetime_picker.dart

@@ -307,7 +307,7 @@ class _DatePickerState extends State<_DatePickerComponent> {
               child: GestureDetector(
                 child: Material(
                   color: theme.backgroundColor ?? Colors.white,
-                  child: _renderPickerView(theme),
+                  child: SafeArea(child: _renderPickerView(theme)),
                 ),
               ),
             ),