[APU] Fixed logged frame count

Until now info about frames that were provided in log was always incorrect by 1

src/xenia/apu/xma_context.cc

@@ -696,7 +696,7 @@ void XmaContext::Decode(XMA_CONTEXT_DATA* data) {
       XELOGAPU(
           "XmaContext {}: Next Offset: {} (Frame: {}/{} Packet: {}/{} Packet "
           "Skip: {} - {})",
-          id(), offset, frame_idx, frame_count, packet_idx,
+          id(), offset, frame_idx, frame_count - 1, packet_idx,
           current_input_packet_count, xma::GetPacketSkipCount(packet),
           data->input_buffer_read_offset);
       if (frame_idx + 1 >= frame_count) {