Fix disconnect button

Pressing disconnect wasn't working because Call.mCallService was being set to null.

Bug: 13119666
Change-Id: Ie79d52ad970e39879dc6e695172e2a28e28864d2
(cherry picked from commit be21aba2e97d783f44734d42c27e2506ec5217ac)
diff --git a/src/com/android/telecomm/OutgoingCallProcessor.java b/src/com/android/telecomm/OutgoingCallProcessor.java
index bfe8cbc..9fbcbbe 100644
--- a/src/com/android/telecomm/OutgoingCallProcessor.java
+++ b/src/com/android/telecomm/OutgoingCallProcessor.java
@@ -166,10 +166,9 @@
      * placed the call.
      */
     void handleSuccessfulCallAttempt() {
-        abort();  // Technically not needed but playing it safe.
         mCall.setCallService(mCallService);
         mCall.setState(CallState.DIALING);
-        resetCallService();
+        abort();
 
         mSwitchboard.handleSuccessfulOutgoingCall(mCall);
     }