Fix problem selecting items in textadept-curses

The textredux lists don't work for me (I tried textredux.fs.open_file) - I seem to get '\r' instead of '\n' when I press enter to select.  This is the fix I'm using (I later found that this had [previously been reported](https://github.com/rgieseke/textredux/issues/2) and fixed (in a different way), but the fix/workaround was recently removed in [commit 5762bf47c4c79f8d9b66f14221f89962e95df6ca](https://github.com/rgieseke/textredux/commit/5762bf47c4c79f8d9b66f14221f89962e95df6ca).

I don't know if this is any better than the previous fix, but I offer it anyway!

Chris