Further linting fixes

lib/inventree/notification.dart

@@ -42,7 +42,7 @@ class InvenTreeNotification extends InvenTreeModel {
    */
   Future<void> dismiss() async {
 
-    final response = await api.post(
+    await api.post(
       "${url}read/",
     );
 

lib/widget/home.dart

@@ -13,7 +13,6 @@ import "package:inventree/settings/login.dart";
 import "package:inventree/settings/settings.dart";
 import "package:inventree/user_profile.dart";
 
-import "package:inventree/inventree/model.dart";
 import "package:inventree/inventree/notification.dart";
 
 import "package:inventree/widget/category_display.dart";