remove new options for style and separate line, now groups all chained

mentions on a mentionsline regardless of placement. fixes spacing

src/components/mentions_line/mentions_line.js

@@ -14,11 +14,8 @@ const MentionsLine = {
     MentionLink
   },
   computed: {
-    oldStyle () {
-      return !this.mergedConfig.mentionsNewStyle
-    },
     limit () {
-      return 6
+      return 2
     },
     mentionsComputed () {
       return this.mentions.slice(0, this.limit)
@@ -29,16 +26,6 @@ const MentionsLine = {
     manyMentions () {
       return this.extraMentions.length > 0
     },
-    buttonClasses () {
-      return [
-        this.oldStyle
-          ? 'button-unstyled'
-          : 'button-default -sublime',
-        this.oldStyle
-          ? '-oldStyle'
-          : '-newStyle'
-      ]
-    },
     ...mapGetters(['mergedConfig'])
   },
   methods: {