Replace wrong `contains` by `includes`

server/methods/addRoomModerator.js

@@ -31,7 +31,7 @@ Meteor.methods({
 			});
 		}
 
-		if (Array.isArray(subscription.roles) === true && subscription.roles.contains('moderator') === true) {
+		if (Array.isArray(subscription.roles) === true && subscription.roles.includes('moderator') === true) {
 			throw new Meteor.Error('error-user-already-moderator', 'User is already a moderator', {
 				method: 'addRoomModerator'
 			});

server/methods/removeRoomModerator.js

@@ -31,7 +31,7 @@ Meteor.methods({
 			});
 		}
 
-		if (Array.isArray(subscription.roles) === false || subscription.roles.contains('moderator') === false) {
+		if (Array.isArray(subscription.roles) === false || subscription.roles.includes('moderator') === false) {
 			throw new Meteor.Error('error-user-not-moderator', 'User is not a moderator', {
 				method: 'removeRoomModerator'
 			});