Fix some mobile UI issues on mining dashboard

frontend/src/app/components/hashrate-chart/hashrate-chart.component.html

@@ -44,12 +44,12 @@
     </form>
   </div>
 
-  <div [class]="!widget ? 'chart' : 'chart-widget'"
-    echarts [initOpts]="chartInitOptions" [options]="chartOptions"></div>
+  <div [class]="!widget ? 'chart' : 'chart-widget'" echarts [initOpts]="chartInitOptions" [options]="chartOptions">
+  </div>
   <div class="text-center loadingGraphs" *ngIf="isLoading">
     <div class="spinner-border text-light"></div>
   </div>
-  
+
 </div>
 
 <ng-template #loadingStats>