qtdemux: set need_segment after a second moov

stream.segment should be updated with the values of the current edit
list, also when a new `moov` is received. Unfortunately this was not
being the case because of an early return.

As a consequence of this bugs, no end of movie clipping was being
performed on the new moov and no segment event was being emitted.

When performing stream switching (e.g. in MSE) the new moov may have a
different edit list. This is often the case when switching between
baseline H.264 (which lacks B-frames) and more demanding profiles. For
this reason it's important to emit a new segment in order to be able
to get matching stream times.
3 jobs for 18-11-29-qtdemuxstream-ctor in 5 minutes and 34 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #54383
manifest

00:00:20

 
  Build
passed #54384
build fedora x86_64

00:01:58

 
  Full Builds
passed #54385
build android arm64 api28

00:03:15