qtdemux: Remove trailing '\n' in debug

8 jobs from qtdemuxdebug in 19 minutes and 53 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #99139
gst indent

00:00:27

passed #99138
manifest

00:00:19

 
  Build
passed #99140
build fedora x86_64

00:03:09

 
  Test
passed #99141
check fedora

00:03:40

 
  Full Builds
passed #99142
build android arm64 api28

00:04:42

passed #99144
build cerbero cross win32

00:11:42

passed #99145
build cerbero cross win64

00:12:34

passed #99143
build cerbero fedora x86_64

00:10:13