properly enable/disable the rename confirm button

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13989 f4695dd4-2c0a-0410-b89c-da849a56a58e
rearrange the renamer files in the project file

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13990 f4695dd4-2c0a-0410-b89c-da849a56a58e