Remove "Wi-Fi only" option from Wi-Fi Calling settings

Bug: 19914582
Change-Id: Iababf6862010812380529440e537958dddbcfdeb
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 09ba335..cce295a 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1893,12 +1893,10 @@
     <string-array name="wifi_calling_mode_choices">
         <item>Wi-Fi preferred</item>
         <item>Cellular preferred</item>
-        <item>Wi-Fi only</item>
     <string-array name="wifi_calling_mode_values">
-        <item>"0"</item>
     <!-- Wi-Fi Calling settings. Text displayed when Wi-Fi Calling is off -->
     <string name="wifi_calling_off_explanation">When Wi-Fi calling is on, your phone can route calls via Wi-Fi networks or your carrier\'s network, depending on your preference and which signal is stronger. Before turning on this feature, check with your carrier regarding fees and other details.</string>