Revert "When adding a new call, use same phone account for call."

This reverts commit 648e1b083ffb76783c87ad4271ea7e16c89b800b.
diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index 1f7c414..a1a8269 100644
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -478,11 +478,6 @@
 
         Log.v(this, "startOutgoingCall found accounts = " + accounts);
 
-        if (mForegroundCall != null && mForegroundCall.getTargetPhoneAccount() != null) {
-            // If there is an ongoing call, use the same phone account to place this new call.
-            phoneAccountHandle = mForegroundCall.getTargetPhoneAccount();
-        }
-
         // Only dial with the requested phoneAccount if it is still valid. Otherwise treat this call
         // as if a phoneAccount was not specified (does the default behavior instead).
         // Note: We will not attempt to dial with a requested phoneAccount if it is disabled.