Fix some properties on the settings page read from ONC.

chromeos/test/data/network/cellular.onc

Index: chromeos/test/data/network/cellular.onc
diff --git a/chromeos/test/data/network/cellular.onc b/chromeos/test/data/network/cellular.onc
index 4c76e3fe1fb1e89a49898d57b01ad075d596018f..50e4d28c652e0e342be386c36d86dbcad51d9b4b 100644
--- a/chromeos/test/data/network/cellular.onc
+++ b/chromeos/test/data/network/cellular.onc
@@ -6,6 +6,7 @@
       "AccessPointName": "test-apn",
       "Username": "test-username",
       "Password": "test-password"
-    }
+    },
+    "AutoConnect": true
   }
 }