I did a quick cleanup in the xml editor, and added copper0 and copper1 to your fzp… it works, not sure if the holes would be right in the gerber.
The .fzp would be in fritzing/parts/user/ depends whether you are on mac or windows. you would need to edit in an xml editor.
Relay 5v DPDT_v2.fzpz (6.2 KB)