[Android] PreferencesActivity: clean up the cleanup

[Edward Wang]

On 13-03-13 12:05 PM, Jean-Baptiste Kempf <jb at videolan.org> wrote:

And finally the issues have been resolved in 
http://git.videolan.org/gitweb.cgi/vlc-ports/android.git/?a=commit;h=348006bc63fa644eb65370d44ab9bb5701b6e834

Regards,
         Edward Wang