Fixed an issue with file saving.
Fixed an issue with file saving.

A method was not correctly written in the internal file dialogs which prevented to 'save as' files and worlds.

This issue has been reported in #779, and the fix is mostly lanceingle's one.

Thanks to him :smile:

Khroki/MCEdit-Unified,fhfuih/MCEdit-Unified,fhfuih/MCEdit-Unified,Khroki/MCEdit-Unified,fhfuih/MCEdit-Unified,Khroki/MCEdit-Unified