Changed Button to fix an issue with plain + icon (#4062)
Changed Button to fix an issue with plain + icon (#4062)

* Changed Button to fix an issue with plain + icon

* Fixed an issue with backward compatibility
HewlettPackard/grommet,HewlettPackard/grommet,grommet/grommet,grommet/grommet,grommet/grommet,HewlettPackard/grommet