Display correct BTC unit depending on network.

frontend/src/app/components/mempool-block/mempool-block.component.html

@@ -22,7 +22,7 @@
             </tr>
             <tr>
               <td>Total fees</td>
-              <td>{{ mempoolBlock.totalFees / 100000000 | number : '1.2-2' }} <ng-template [ngIf]="network === 'liquid'">L-</ng-template>BTC (<app-fiat [value]="mempoolBlock.totalFees" digitsInfo="1.0-0"></app-fiat>)</td>
+              <td><app-amount [satoshis]="mempoolBlock.totalFees" [digitsInfo]="'1.2-2'"></app-amount> (<app-fiat [value]="mempoolBlock.totalFees" digitsInfo="1.0-0"></app-fiat>)</td>
             </tr>
             <tr>
               <td>Transactions</td>