fix potential bug where canonical alias setting is broken (modulo autoheisting)

src/components/views/room_settings/AliasSettings.js

@@ -86,10 +86,8 @@ module.exports = React.createClass({
             );
         }
 
-
         // save new aliases for m.room.aliases
         var aliasOperations = this.getAliasOperations();
-        var promises = [];
         for (var i = 0; i < aliasOperations.length; i++) {
             var alias_operation = aliasOperations[i];
             console.log("alias %s %s", alias_operation.place, alias_operation.val);