Updated setState types

[JDMathew]

The types specified for SetValue, SetOpen and SetItems are incorrect because we explicitly pass a call back or a value in the Picker. The types used were the generic React Types for SetState

For example see SetValue here:

react-native-dropdown-picker/src/components/Picker.js

Lines 1229 to 1254 in 743acd6

	setValue(state => {
	if (multiple) {
	let _state = state !== null ? [...state] : [];
	if (_state.includes(item[_schema.value])) {
	// Remove the value
	if (Number.isInteger(min) && min >= _state.length) {
	return state;
	}
	const index = _state.findIndex(x => x === item[_schema.value]);
	_state.splice(index, 1);
	} else {
	// Add the value
	if (Number.isInteger(max) && max <= _state.length) {
	return state;
	}
	_state.push(item[_schema.value]);
	}
	return _state;
	} else {
	return item[_schema.value];
	}
	});

[hossein-zare]

Thank you for the changes.