Add api domain to Thirdweb domain tests

Included 'api.thirdweb.com' in the domain list for test coverage in domain.test.ts.

Author: 0xFirekeeper

packages/thirdweb/src/utils/domain.test.ts

@@ -18,6 +18,7 @@ describe("Thirdweb Domains", () => {
     rpc: "rpc.thirdweb.com",
     social: "social.thirdweb.com",
     storage: "storage.thirdweb.com",
+    api: "api.thirdweb.com",
   };
 
   beforeEach(() => {