Remove errant mailbox path modification

src/Website/Startup.cs

@@ -51,7 +51,7 @@ namespace Website
 				client.DefaultRequestHeaders.Add("x-api-key", new[] { Configuration["authApiKey"] });
 			});
 			services.AddHttpClient<IMailboxesApi, MailboxesApi>(client => {
-				client.BaseAddress = new Uri(Configuration["mailboxesApiEndpoint"] + "api/");
+				client.BaseAddress = new Uri(Configuration["mailboxesApiEndpoint"]);
 				client.DefaultRequestHeaders.Add("x-api-key", new[] { Configuration["authApiKey"] });
 			});