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.vue

@@ -25,15 +25,13 @@
         />
       </span><button
         v-if="!expanded"
-        class="showMoreLess"
-        :class="buttonClasses"
+        class="button-unstyled showMoreLess"
         @click="toggleShowMore"
       >
         {{ $t('status.plus_more', { number: extraMentions.length }) }}
       </button><button
         v-if="expanded"
-        class="showMoreLess"
-        :class="buttonClasses"
+        class="button-unstyled showMoreLess"
         @click="toggleShowMore"
       >
         {{ $t('general.show_less') }}