Revert "fix: value is not work when set to null (#913)" (#925)

This reverts commit 6bc9cb4.

Author: zombieJ

src/PickerInput/hooks/useRangeValue.ts

@@ -116,11 +116,8 @@ export function useInnerValue<ValueType extends DateType[], DateType extends obj
   ) => void,
   onOk?: (dates: ValueType) => void,
 ) {
-  const isNullValue = value === null;
   // This is the root value which will sync with controlled or uncontrolled value
-  const [innerValue, setInnerValue] = useMergedState(defaultValue, {
-    value: isNullValue ? undefined : value,
-  });
+  const [innerValue, setInnerValue] = useMergedState(defaultValue, { value });
   const mergedValue = innerValue || (EMPTY_VALUE as ValueType);
 
   // ========================= Inner Values =========================