WiFiCallingSettings: show roaming preferrence

Bug: 31492826
Change-Id: I45cd8455e84802d690d074099d6a8e9c9398e157
diff --git a/src/com/android/settings/WirelessSettings.java b/src/com/android/settings/WirelessSettings.java
index 7e3b8d8..7434e67 100644
--- a/src/com/android/settings/WirelessSettings.java
+++ b/src/com/android/settings/WirelessSettings.java
@@ -362,7 +362,7 @@
             getPreferenceScreen().addPreference(mButtonWfc);
 
             mButtonWfc.setSummary(WifiCallingSettings.getWfcModeSummary(
-                    context, ImsManager.getWfcMode(context)));
+                    context, ImsManager.getWfcMode(context, mTm.isNetworkRoaming())));
         } else {
             removePreference(KEY_WFC_SETTINGS);
         }