dsp_interface: Move sink to the last in member list (#5844)

So that it is destructed first. Otherwise, the TimeStretcher will be destructed before the Sink, which might cause segfaults when the Sink tries to read data from the TimeStretcher afterwards.

src/audio_core/dsp_interface.h

@@ -108,12 +108,12 @@ private:
     void FlushResidualStretcherAudio();
     void OutputCallback(s16* buffer, std::size_t num_frames);
 
-    std::unique_ptr<Sink> sink;
     std::atomic<bool> perform_time_stretching = false;
     std::atomic<bool> flushing_time_stretcher = false;
     Common::RingBuffer<s16, 0x2000, 2> fifo;
     std::array<s16, 2> last_frame{};
     TimeStretcher time_stretcher;
+    std::unique_ptr<Sink> sink;
 
     template <class Archive>
     void serialize(Archive& ar, const unsigned int) {}