Finally remove utils.Cfg (#8113)

* finally remove utils.Cfg

* fix compile error

* another test compilation fix

app/diagnostics_test.go

@@ -155,9 +155,7 @@ func TestDiagnostics(t *testing.T) {
 	})
 
 	t.Run("SendDailyDiagnosticsDisabled", func(t *testing.T) {
-		oldSetting := *th.App.Config().LogSettings.EnableDiagnostics
 		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.LogSettings.EnableDiagnostics = false })
-		defer th.App.UpdateConfig(func(cfg *model.Config) { *cfg.LogSettings.EnableDiagnostics = oldSetting })
 
 		th.App.SendDailyDiagnostics()