Remove magic constants from menu module

Author: dronelektron

scripting/include/cm/class.inc

@@ -4,6 +4,8 @@
 #define _class_included
 
 #define CLASS_NAME_SIZE 32
+#define CLASS_DISABLED 0
+#define CLASS_UNLIMITED -1
 
 enum {
     Class_Unknown = -1,

scripting/modules/menu.sp

@@ -100,11 +100,11 @@ int MenuHandler_ClassAction(Menu menu, MenuAction action, int param1, int param2
         menu.GetItem(param2, info, sizeof(info));
 
         if (StrEqual(info, ENABLE_CLASS)) {
-            g_selectedLimit[param1] = -1;
+            g_selectedLimit[param1] = CLASS_UNLIMITED;
 
             Menu_TeamAction(param1);
         } else if (StrEqual(info, DISABLE_CLASS)) {
-            g_selectedLimit[param1] = 0;
+            g_selectedLimit[param1] = CLASS_DISABLED;
 
             Menu_TeamAction(param1);
         } else if (StrEqual(info, SET_CLASS_LIMIT)) {