chore: Clean up reply box component (#13060)

app/javascript/dashboard/components/widgets/conversation/ReplyBox.vue

@@ -411,13 +411,6 @@ export default {
         return true;
       }
 
-      if (this.isAPIInbox) {
-        const {
-          display_rich_content_editor: displayRichContentEditor = false,
-        } = this.uiSettings;
-        return displayRichContentEditor;
-      }
-
       return false;
     },
     // ensure that the signature is plain text depending on `showRichContentEditor`
@@ -697,7 +690,7 @@ export default {
     onPaste(e) {
       const data = e.clipboardData.files;
       if (!this.showRichContentEditor && data.length !== 0) {
-        this.$refs.messageInput.$el.blur();
+        this.$refs.messageInput?.$el?.blur();
       }
       if (!data.length || !data[0]) {
         return;