[BUGFIX] QT movies prefixed abusively in Media CE

If some prefixes are defined (either base URL or absRefPrefix),
the Media CE will apply such prefix to any Quicktime movie
even if said movie is referenced by an absolute URL.

Change-Id: Ibe8b24da5fdf3689d841987f45e91c750a7a002c
Fixes: #39026
Releases: 6.0,4.7,4.6,4.5
Reviewed-on: http://review.typo3.org/12847
Reviewed-by: Francois Suter
Tested-by: Francois Suter