Using dark theme for ProgressDialog

Bug: 68822513

Change-Id: I933a5867bc38867747f55e4b50192fe76fd4d568
(cherry picked from commit 2c19fb7dc4b0a630455954a907b713cb8f21048c)
diff --git a/src/com/android/phone/PhoneUtils.java b/src/com/android/phone/PhoneUtils.java
index 50e7f0a..14640e7 100644
--- a/src/com/android/phone/PhoneUtils.java
+++ b/src/com/android/phone/PhoneUtils.java
@@ -130,7 +130,7 @@
      * because these dialogs are displayed using the application context, which does not resolve
      * the dialog theme correctly.
      */
-    private static final int THEME = AlertDialog.THEME_DEVICE_DEFAULT_LIGHT;
+    private static final int THEME = com.android.internal.R.style.Theme_DeviceDefault_Dialog_Alert;
 
     private static class FgRingCalls {
         private Call fgCall;