fix: Fix internal unrecognized command error processing

lib/classes/plugin-manager.js

@@ -487,10 +487,10 @@ class PluginManager {
 
         // Invalid command, can happen only when Framework is used programmatically,
         // as otherwise command is validated in main script
-        throw new new ServerlessError(
+        throw new ServerlessError(
           `Unrecognized command "${commandsArray.join(' ')}"`,
           'UNRECOGNIZED COMMAND'
-        )();
+        );
       },
       { commands: this.commands }
     );