fix when runOnDemand for HLS, variable MTX_QUERY is empty. #3255
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The following environment variables are available:
...
* MTX_QUERY: query parameters (passed by first reader)
runOnDemand:
...
The comments in the configuration file say that MTX_QUERY is available, but in fact, it is empty when the HLS stream is requested.
I passed the query from the hls/http_server to the muxer.