fix(ItemSelector): preserve item layout during drag and drop

[DaryaVorontsova]

The item layout breaks when dragging items in the ItemSelector. See the attached screenshot.

The item is rendered as follows:

export const renderItemValue = (item) => (
    <Flex gap={1} width="100%">
        <Icon
            style={{flexShrink: 0}}
            data={SCHEMA_TYPE_ICONS[item.iconType]}
        />
        {item.name}
        <Text color="secondary">{item.count}</Text>
    </Flex>
);