rm obsolete order for spec blackman window

src/frontend/spec.c

@@ -126,11 +126,6 @@ com_spec(wordlist *wl)
                 }
             }
         else if (eq(window, "blackman")) {
-            int order;
-            if (!cp_getvar("specwindoworder", CP_NUM, &order, 0))
-                order = 2;
-            if (order < 2)      /* only order 2 supported here */
-                order = 2;
             for (i = 0; i < tlen; i++) {
                 if (maxt-time[i] > span) {
                     win[i] = 0;