Convert rocketchat-slashcommands-leave to main module structure (#12821)

packages/rocketchat-slashcommands-leave/package.js

@@ -10,6 +10,5 @@ Package.onUse(function(api) {
 		'ecmascript',
 		'rocketchat:lib',
 	]);
-
-	api.addFiles('leave.js', 'server');
+	api.mainModule('server/index.js', 'server');
 });

packages/rocketchat-slashcommands-leave/server/index.js

@@ -0,0 +1 @@
+import './leave';

packages/rocketchat-slashcommands-leave/server/leave.js

@@ -1,6 +1,7 @@
 import { Meteor } from 'meteor/meteor';
 import { Random } from 'meteor/random';
 import { TAPi18n } from 'meteor/tap:i18n';
+import { RocketChat } from 'meteor/rocketchat:lib';
 
 /*
 * Leave is a named function that will replace /leave commands