Custom checkbox component is still visible regardless of checkbox value.

[Yimura]

Description

#107 was only partially fixed by #114, only the default image checkbox disappears if the item value is false.
The custom component checkboxComponent is still visible as per the below code.

Relevant Code

react-native-select/src/components/CheckBox/index.tsx

Lines 52 to 61 in f51b3f0

	{checkboxComponent || (
	<View style={checkBoxDimensions}>
	{value ? (
	<Image
	source={require('../../asset/check.png')}
	style={checkBoxDimensions}
	/>
	) : null}
	</View>
	)}