Added fiat balance to address and made fiat balance into a component.

frontend/src/app/components/address/address.component.ts

@@ -49,6 +49,7 @@ export class AddressComponent implements OnInit, OnDestroy {
         this.error = undefined;
         this.isLoadingAddress = true;
         this.loadedConfirmedTxCount = 0;
+        this.address = null;
         this.isLoadingTransactions = true;
         this.transactions = null;
         document.body.scrollTo(0, 0);