LinGui: Improve auto destination file name behavior
Don't change the destination file name when a setting changes that is
not in the auto-name template.  I.e. if quality changes and "{quality}" is
not in the template, leave the destination file name alone.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6200 b64f7644-9d1e-0410-96f1-a4d463321fa5