config.def.h: ClkTagBar missing from comment

by Christopher Drelich <cd@cdrakka.com>

Patch was mangled on the ML, also adjusted the order to be the same as
the enum in dwm.c

config.def.h

@@ -97,7 +97,7 @@ static Key keys[] = {
 };
 
 /* button definitions */
-/* click can be ClkLtSymbol, ClkStatusText, ClkWinTitle, ClkClientWin, or ClkRootWin */
+/* click can be ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle, ClkClientWin, or ClkRootWin */
 static Button buttons[] = {
 	/* click                event mask      button          function        argument */
 	{ ClkLtSymbol,          0,              Button1,        setlayout,      {0} },