Don't error on frame end without start (#666)

With on-demand profiling we're very likely to connect in the middle of a
discontinuous frame and thus receive a frame end without any preceding
frame start. So don't error out in this case.

server/TracyWorker.hpp

@@ -980,6 +980,7 @@ private:
     int m_bufferOffset;
     bool m_onDemand;
     bool m_ignoreMemFreeFaults;
+    bool m_ignoreFrameEndFaults;
     bool m_codeTransfer;
     bool m_combineSamples;
     bool m_identifySamples = false;