DEV: Update more deprecated Font Awesome icon names (#104)

* DEV: Update more deprecated Font Awesome icon names

* update bars-staggered

javascripts/discourse/components/toc-mini-buttons.gjs

@@ -25,7 +25,7 @@ export default class TocMiniButtons extends Component {
       />
       <DButton
         @action={{this.closeOverlay}}
-        @icon="times"
+        @icon="xmark"
         class="btn btn-transparent d-toc-close"
       />
     </div>

javascripts/discourse/components/toc-mini.gjs

@@ -42,7 +42,7 @@ export default class TocMini extends Component {
       <span class="d-toc-mini">
         <DButton
           class="btn-primary"
-          @icon="stream"
+          @icon="bars-staggered"
           @action={{this.toggleTOCOverlay}}
         />
       </span>

javascripts/discourse/components/toc-toggle.gjs

@@ -22,7 +22,7 @@ export default class TocToggle extends Component {
   }
 
   get toggleIcon() {
-    return this.tocProcessor.isTocVisible ? "timeline" : "stream";
+    return this.tocProcessor.isTocVisible ? "timeline" : "bars-staggered";
   }
 
   <template>