Add missing type in GrommetProps (#4558)
Add missing type in GrommetProps (#4558)

Signed-off-by: Hassan Usman <b06241c93eb3d1cbefadb850507e80b6c3e09572@gmail.com>

Co-authored-by: Shimi <91d179157e4fb8ed4d1a2fb40c584b1ced338ef7@gmail.com>
HewlettPackard/grommet,HewlettPackard/grommet,grommet/grommet,HewlettPackard/grommet,grommet/grommet,grommet/grommet