Redesign difficulty adjustment dashboard widget

frontend/src/app/components/mining-dashboard/mining-dashboard.component.html

@@ -22,7 +22,7 @@
     <!-- difficulty adjustment -->
     <div class="col">
       <div class="main-title" i18n="dashboard.difficulty-adjustment">Difficulty Adjustment</div>
-      <app-difficulty [attr.data-cy]="'difficulty-adjustment'" [showTitle]="false" [showProgress]="false" [showHalving]="true"></app-difficulty>
+      <app-difficulty-mining [attr.data-cy]="'difficulty-adjustment'" [showTitle]="false" [showProgress]="false" [showHalving]="true"></app-difficulty-mining>
     </div>
 
     <!-- pool distribution -->