Change the string's text field from static to editable, so options not in the
wizard can be added. Uses the string from this field directly, rather than the
stored string.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>
(cherry picked from commit 40c5ee7f)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>