Fix PlaybackSock::GetMaxBitrate protocol usage.

QUERY_REMOTEENCODER now returns only one value.  This change was missed
when the protocol was changed to send 64-bit values directly, instead of
encoded as two 32-bit ints (this part, specifically, in 1508085 ).

Signed-off-by: Michael T. Dean <mdean@mythtv.org>

mythtv/programs/mythbackend/playbacksock.cpp

@@ -403,7 +403,7 @@ long long PlaybackSock::GetMaxBitrate(int capturecardnum)
     QStringList strlist(QString("QUERY_REMOTEENCODER %1").arg(capturecardnum));
     strlist << "GET_MAX_BITRATE";
 
-    if (SendReceiveStringList(strlist, 2))
+    if (SendReceiveStringList(strlist, 1))
         return strlist[0].toLongLong();
 
     return 20200000LL; // Peak bit rate for HD-PVR