updating viewBox of Overlay icon so that hover will have even lineweights: https://github.com/grommet/grommet-estories/issues/128
updating viewBox of Overlay icon so that hover will have even lineweights:
https://github.com/grommet/grommet-estories/issues/128

Signed-off-by: Jackie Wijaya <a1bd68b596538eefe75c18d0f33235ef95568d46@webmocha.com>

primozs/grommet,codeswan/grommet,codeswan/grommet,primozs/grommet,HewlettPackard/grommet,HewlettPackard/grommet,kylebyerly-hp/grommet,davrodpin/grommet,linde12/grommet,davrodpin/grommet,nickjvm/grommet,nickjvm/grommet,HewlettPackard/grommet,grommet/grommet,grommet/grommet,grommet/grommet