[gstreamer] Always send a new segment with stream time starting with 0 for video branch. Contributes to JB#8764
[gstreamer] Always send a new segment with stream time starting with 0 for video branch. Contributes to JB#8764

sailfishos/gst-droidcamsrc,sailfishos/gst-droidcamsrc,sailfishos/gst-droidcamsrc