floatingLabel not working correctly in SingleSelect.

[shivwork]

<MaterialSelectField
disabled={disabled ? disabled : false}
showAutocompleteThreshold={1}
errorText={touched && error}
floatingLabel={label}
value={selectedObj}
nb2show={7}
anchorOrigin={{ vertical: 'top', horizontal: 'left' }}
required={true}
onChange={(e) => changeSelectedObj(e)}
hoverColor='rgba(3, 169, 244, 0.15)'
>
{optionsList}

[Sharlaan]

see #67