Always delete the AREASxxxxxx temp file

When there are no changes (areas added or removed) via an areafix message, the
data/AREASxxxxxx temp file would be left behind. The file was only removed if
areas were added or removed from the area file via areafix message.

The orphaned data/AREASxxxxxxx files were reported via DOVE-Net by Gamgee (PALANTIR)
If you have these stale files, you can safely delete them.

src/sbbs3/sbbsecho.c

@@ -1793,6 +1793,7 @@ void alter_areas(str_list_t add_area, str_list_t del_area, fidoaddr_t addr, cons
 		if(rename(outpath,cfg.areafile))		   /* Rename new AREAS.BBS file */
 			lprintf(LOG_ERR,"ERROR line %d renaming %s to %s",__LINE__,outpath,cfg.areafile);
 	}
+	remove(outpath); // expected to fail (file does not exist) much of the time
 }
 
 bool add_sub_to_arealist(sub_t* sub, fidoaddr_t uplink)