FileDialog.h: 2011-07-28 Steven Lambright - Now connects to the buttons'...

FileDialog.h: 2011-07-28 Steven Lambright - Now connects to the buttons' clicked signals instead of pressed, clicked is the appropriate signal. Fixes #270 

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2888 41f8697f-d340-4b68-9986-7bafba869bb8