Fix heal command for players with more health than 20

src/main/java/com/sk89q/worldguard/bukkit/commands/GeneralCommands.java

@@ -150,7 +150,7 @@ public void heal(CommandContext args,CommandSender sender) throws CommandExcepti
         }
 
         for (Player player : targets) {
-            player.setHealth(20);
+            player.setHealth(player.getMaxHealth());
             player.setFoodLevel(20);
             
             // Tell the user