Fix selected prop for multiple select (#2127)
Fix selected prop for multiple select (#2127)

* Fix selected prop for multiple select

* not mutating prop

fixing travis ci linting error

* fixed typos

* cleaning up linting error

* changed selectedValuesIx to selectedIndexes

* removed check if options prop is array

* Update SelectContainer.js

* Update SelectContainer.js

grommet/grommet,HewlettPackard/grommet,grommet/grommet,grommet/grommet,HewlettPackard/grommet,HewlettPackard/grommet