emoji react: make keep picker button do something

Signed-off-by: Sam Therapy <sam@samtherapy.net>

src/components/react_button/react_button.js

@@ -25,7 +25,8 @@ const ReactButton = {
       } else {
         this.$store.dispatch('reactWithEmoji', { id: this.status.id, emoji })
       }
-      close()
+
+      if (!event.keepOpen) { close() }
     },
     focusInput () {
       this.$nextTick(() => {