Default file exists action -> rename

[orengt]

When selecting a file from the queue and setting it's Default file exists action to rename, the new name is recognize as a existing file.
To reproduce:
1. Add a file to the queue
2. Open the Default file exists action and select rename.
3. Process the queue.
4. When prompt for a new name type in a new name, say new.txt and submit it.

--> File exists dialog will popup again with a message saying the new.txt already exists.

[codesquid]

Will be fixed in the next version.