matroskademux: Emit no-more-pads after parsing Tracks

Currently matroskademux does not emit no-more-pads until the first
Cluster is parsed, even though the Tracks have already been parsed and
from that point on there can be no more tracks.

This is important in MSE because the browser needs to know when the MSE
initialization segment has been completely parsed so that it can expose
the tracks to the user. Some applications depend on this been done
before they feed frames to the demuxer.

As a consequence, historically WebKit has relied on hacks such as
listening to the `pad-added` event, which made impossible to support
multiple tracks in the same file. Let's fix that.
diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index 08e5a60..1b95451 100644
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -2811,6 +2811,8 @@
   DEBUG_ELEMENT_STOP (demux, ebml, "Tracks", ret);
   demux->tracks_parsed = TRUE;
+  GST_DEBUG_OBJECT (demux, "signaling no more pads");
+  gst_element_no_more_pads (GST_ELEMENT (demux));
   return ret;
@@ -4855,8 +4857,7 @@
                     GST_TIME_ARGS (demux->common.segment.duration));
-            GST_DEBUG_OBJECT (demux, "signaling no more pads");
-            gst_element_no_more_pads (GST_ELEMENT (demux));
             /* send initial segment - we wait till we know the first
                incoming timestamp, so we can properly set the start of
                the segment. */