xfprint gets its default printer from the PRINTER environment variable. 
However, if the user changes the default printer and clicks the "Save settings"
button, this does not save the new printer choice, and when xfprint is used
again, it defaults back to the old printer.


Reproducible: Always
Steps to Reproduce:
1. start xfprint
2. change printer
3. save settings
4. exit xfprint
5. start xfprint

Actual Results:  
PRINTER is original printer - not changed printer that was saved

Expected Results:  
I would have expected the saved printer to be chosen.