Set default color of single-SIM PhoneAccount to NO_COLOR.

The default SIM of a Single-SIM phones should not have a color so that
the InCallUI uses the default theme color.

Bug: 18239553
Change-Id: I042918d6f4756e39339e18b4cb65ec83c09805fb
diff --git a/src/com/android/services/telephony/TelecomAccountRegistry.java b/src/com/android/services/telephony/TelecomAccountRegistry.java
index ef63068..746c8bc 100644
--- a/src/com/android/services/telephony/TelecomAccountRegistry.java
+++ b/src/com/android/services/telephony/TelecomAccountRegistry.java
@@ -103,7 +103,7 @@
 
             // Populate the phone account data.
             int subId = mPhone.getSubId();
-            int color = 0;
+            int color = PhoneAccount.NO_COLOR;
             int slotId = SubscriptionManager.INVALID_SLOT_ID;
             String line1Number = mTelephonyManager.getLine1NumberForSubscriber(subId);
             if (line1Number == null) {