Fix post dial for remote connections

Use the correct callback (onPostDialChar instead of onPostDialWait).
This fixes a bug where every remote call would prompt the user
to send tones after the call became active.

BUG: 21004101
Change-Id: I1656a4266d0028ef29494a3cee169180267e16cd

telecomm/java/android/telecom/RemoteConnection.java

@@ -960,7 +960,7 @@ public final class RemoteConnection {
             record.getHandler().post(new Runnable() {
                 @Override
                 public void run() {
-                    callback.onPostDialWait(connection, String.valueOf(nextChar));
+                    callback.onPostDialChar(connection, nextChar);
                 }
             });
         }