ui/gtk3: Add num pad Enter, Down, Up, Left, Right on Emojier
ui/gtk3: Add num pad Enter, Down, Up, Left, Right on Emojier

BUG=rhbz#1554813
R=Shawn.P.Huang@gmail.com

Review URL: https://codereview.appspot.com/337690043

fujiwarat/ibus,fujiwarat/ibus,fujiwarat/ibus,ibus/ibus,fujiwarat/ibus,ibus/ibus,ibus/ibus,ibus/ibus