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*.

WPrefs.app/WPrefs.c

@@ -149,7 +149,7 @@ static void save(WMWidget * w, void *data)
 	WMReleasePropList(keyList);
 	/*    puts("storing data"); */
 
-	WMWritePropListToFile(WindowMakerDB, WindowMakerDBPath, True);
+	WMWritePropListToFile(WindowMakerDB, WindowMakerDBPath);
 
 	memset(&ev, 0, sizeof(XEvent));