Fully reset domain-list page on registrar change (#2456)

When the registrar changes we should reset the page and the total
results to 0 (since we haven't loaded them yet)

https://b.corp.google.com/issues/343193698

console-webapp/src/app/domains/domainList.component.ts

@@ -59,6 +59,8 @@ export class DomainListComponent {
   ) {
     effect(() => {
       if (this.registrarService.registrarId()) {
+        this.pageNumber = 0;
+        this.totalResults = 0;
         this.reloadData();
       }
     });