Updating flip icon

frontend/src/app/components/blockchain/blockchain.component.html

@@ -6,7 +6,7 @@
         <app-blockchain-blocks></app-blockchain-blocks>
       </div>
       <div id="divider">
-        <button class="time-toggle" (click)="toggleTimeDirection()"><fa-icon [icon]="['fas', 'arrows-rotate']" [fixedWidth]="true"></fa-icon></button>
+        <button class="time-toggle" (click)="toggleTimeDirection()"><fa-icon [icon]="['fas', 'exchange-alt']" [fixedWidth]="true"></fa-icon></button>
       </div>
     </span>
   </div>

frontend/src/app/shared/shared.module.ts

@@ -303,5 +303,6 @@ export class SharedModule {
     library.addIcons(faDownload);
     library.addIcons(faQrcode);
     library.addIcons(faArrowRightArrowLeft);
+    library.addIcons(faExchangeAlt);
   }
 }