Removed #define for update interval

Debugging #define, especially in mathematical constructs is very
difficult. The performance overhead of static const int is negligible.

config.def.h

@@ -1,7 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 
 /* how often to update the statusbar (min value == 1) */
-#define UPDATE_INTERVAL 1
+static const int update_interval = 1;
 
 /* text to show if no value can be retrieved */
 #define UNKNOWN_STR "n/a"

slstatus.c

@@ -914,11 +914,11 @@ main(int argc, char *argv[])
 			XSync(dpy, False);
 		}
 
-		if ((UPDATE_INTERVAL - delay) <= 0) {
+		if ((update_interval - delay) <= 0) {
 			delay = 0;
 			continue;
 		} else {
-			sleep(UPDATE_INTERVAL - delay);
+			sleep(update_interval - delay);
 			delay = 0;
 		}
 	}