Fixed a mistake in spaced command handling

Nothing drastic, just a self-defeating line of code.

src/pocketmine/command/SimpleCommandMap.php

@@ -188,7 +188,7 @@ class SimpleCommandMap implements CommandMap{
 	 * @return Command|null
 	 */
 	public function matchCommand(string &$commandName, array &$args){
-		$count = max(count($args), 255);
+		$count = min(count($args), 255);
 
 		for($i = 0; $i < $count; ++$i){
 			$commandName .= array_shift($args);