Fix the UniquePreferenceTest.

By adding in the About Phone v2 screen, we duplicated some settings.

This isn't actually a problem because when the flag to turn on V2 is on,
V1 goes away, and vice versa.

Change-Id: I9aa327ac532ed2ac240bb2d6cbb327f299438889
Bug: 72459760
Test: adb shell am instrument -w -e class
com.android.settings.core.UniquePreferenceTest
com.android.settings.tests.unit/android.support.test.runner.AndroidJUnitRunner

tests/unit/src/com/android/settings/core/UniquePreferenceTest.java

@@ -74,7 +74,24 @@ public class UniquePreferenceTest {
             "toggle_bluetooth",
             "toggle_nfc",
             "android_beam_settings",
-            "sms_mirroring"
+            "sms_mirroring",
+            // Dup keys from About Phone v2 experiment.
+            "ims_reg_state",
+            "bt_address",
+            "device_model",
+            "firmware_version",
+            "regulatory_info",
+            "manual",
+            "legal_container",
+            "device_feedback",
+            "fcc_equipment_id",
+            "sim_status",
+            "build_number",
+            "phone_number",
+            "imei_info",
+            "wifi_ip_address",
+            "wifi_mac_address",
+            "safety_info"
     );
 
     private Context mContext;