unboolify dmenu

config.def.h

@@ -1,7 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 /* Default settings; can be overriden by command line. */
 
-static bool topbar = true;                  /* -b  option; if False, dmenu appears at bottom */
+static int topbar = 1;                      /* -b  option; if 0, dmenu appears at bottom     */
 /* -fn option overrides fonts[0]; default X11 font or font set */
 static const char *fonts[] = {
 	"monospace:size=10"