simplify WMWritePropListToFile()

remove the choice of atomic/non-atomic writes. firstly, the only users
of non-atomic writes were getstyle and geticonset; secondly, who in their
right minds would ever want non-atomic writes; thirdly, the file system
will screw you anyway *G*.

util/seticons.c

@@ -135,7 +135,7 @@ int main(int argc, char **argv)
 		}
 	}
 
-	WMWritePropListToFile(all_windows, path, True);
+	WMWritePropListToFile(all_windows, path);
 
 	exit(0);
 }