Navi: Fix mismatch in field trial

Bug: 874153
Change-Id: I4ce99a2d812bbd5ca30eb9431231470823e33636
Reviewed-on: https://chromium-review.googlesource.com/c/1377359
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616570}
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index f5e88092..3438527 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -2902,6 +2902,7 @@
                     "params": {
                         "new-user-modules": "nux-email,nux-google-apps,nux-set-as-default,signin-view",
                         "onboarding-group": "EmailAppsThenEmailInterstitial-001",
+                        "returning-user-modules": "nux-set-as-default",
                         "show-email-interstitial": "true"
                     },
                     "enable_features": [