Add SelfUrl to startup template

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/wwwroot/appsettings.json

@@ -1,4 +1,7 @@
 {
+  "App": {
+    "SelfUrl": "https://localhost:44305"
+  },
   "AuthServer": {
     "Authority": "https://localhost:44305",
     "ClientId": "MyProjectName_Blazor",
@@ -7,6 +10,6 @@
   "RemoteServices": {
     "Default": {
       "BaseUrl": "https://localhost:44305"
-    } 
+    }
-  } 
+  }
 }

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Host/wwwroot/appsettings.json

@@ -1,4 +1,7 @@
 {
+  "App": {
+    "SelfUrl": "https://localhost:44301"
+  },
   "AuthServer": {
     "Authority": "https://localhost:44301",
     "ClientId": "MyProjectName_Blazor",