Make VideoStream::isPlaying return false when EOS has been reached

Before it would return the playing status of the FrameSync, but a DeltaSync doesn't stop at the end of the video, now it returns the least of the FrameSync and the EOS condition

src/modules/video/theora/VideoStream.cpp

@@ -120,6 +120,11 @@ size_t VideoStream::getSize() const
 	return sizeof(Frame);
 }
 
+bool VideoStream::isPlaying() const
+{
+	return frameSync->isPlaying() && !eos;
+}
+
 void VideoStream::readPage()
 {
 	char *syncBuffer = nullptr;

src/modules/video/theora/VideoStream.h

@@ -56,6 +56,8 @@ public:
 	const std::string &getFilename() const;
 	void setSync(FrameSync *frameSync);
 
+	bool isPlaying() const;
+
 	void threadedFillBackBuffer(double dt);
 
 private: