IssueNotesRefactor: Fix bottom padding inconsistency of reply form.

app/assets/javascripts/notes/components/issue_discussion.vue

@@ -173,7 +173,9 @@
                     />
                 </ul>
                 <div class="flash-container"></div>
-                <div class="discussion-reply-holder">
+                <div
+                  :class="{ 'is-replying': isReplying }"
+                  class="discussion-reply-holder">
                   <button
                     v-if="canReply && !isReplying"
                     @click="showReplyForm"

app/assets/stylesheets/pages/note_form.scss

@@ -198,6 +198,10 @@
   .discussion-reply-holder {
     background-color: $white-light;
     padding: 10px 16px;
+
+    &.is-replying {
+      padding-bottom: $gl-padding;
+    }
   }
 }