Fix issues found by Biome

Author: wojtekmaj

packages/react-date-picker/src/DateInput/Input.tsx

@@ -148,7 +148,7 @@ export default function Input({
   value,
 }: InputProps): React.ReactElement {
   useIsomorphicLayoutEffect(() => {
-    if (!inputRef || !inputRef.current) {
+    if (!inputRef?.current) {
       return;
     }
 

packages/react-date-picker/src/DatePicker.tsx

@@ -474,7 +474,7 @@ export default function DatePicker(props: DatePickerProps): React.ReactElement {
         target &&
         wrapperEl &&
         !wrapperEl.contains(target) &&
-        (!calendarWrapperEl || !calendarWrapperEl.contains(target))
+        !calendarWrapperEl?.contains(target)
       ) {
         closeCalendar({ reason: 'outsideAction' });
       }