Do not use unstable Android styable.CheckBoxPreference

Make a local copy instead.

Bug: 137202333
Test: manual - edit phone number dialog in call forwarding works fine.
Change-Id: I73c7afb8ca018652099964b5b6f39e9244634803
diff --git a/src/com/android/phone/EditPhoneNumberPreference.java b/src/com/android/phone/EditPhoneNumberPreference.java
index 74b8a45..35af20d 100644
--- a/src/com/android/phone/EditPhoneNumberPreference.java
+++ b/src/com/android/phone/EditPhoneNumberPreference.java
@@ -136,9 +136,9 @@
         a.recycle();
 
         //get the summary settings, use CheckBoxPreference as the standard.
-        a = context.obtainStyledAttributes(attrs, android.R.styleable.CheckBoxPreference, 0, 0);
-        mSummaryOn = a.getString(android.R.styleable.CheckBoxPreference_summaryOn);
-        mSummaryOff = a.getString(android.R.styleable.CheckBoxPreference_summaryOff);
+        a = context.obtainStyledAttributes(attrs, R.styleable.CheckBoxPreference, 0, 0);
+        mSummaryOn = a.getString(R.styleable.CheckBoxPreference_summaryOn);
+        mSummaryOff = a.getString(R.styleable.CheckBoxPreference_summaryOff);
         a.recycle();
     }