Don't register prefixed non-primary aliases

just the primary alias (as in, the command ID) is enough

Author: dktapps

src/command/SimpleCommandMap.php

@@ -163,7 +163,6 @@ public function register(string $fallbackPrefix, Command $command, string $prefe
 		$this->mapAlias($fallbackPrefix . ":" . $preferredAlias, $command, $registeredAliases);
 
 		foreach($otherAliases as $alias){
-			$this->mapAlias($fallbackPrefix . ":" . $alias, $command, $registeredAliases);
 			if(!isset($this->aliasToCommandMap[$alias])){
 				$this->mapAlias($alias, $command, $registeredAliases);
 			}