Makes the enter key work properly on mobile chat

SEMobileChatEnter.user.js

// ==UserScript==
// @name          SEMobileChatEnter
// @namespace     http://vulpin.com/
// @description   Makes the enter key work properly on mobile chat
// @match         *://chat.stackexchange.com/*
// @match         *://chat.stackoverflow.com/*
// @version       1.0.0
// @grant         none
// ==/UserScript==

(function() {
var Program = {
    main: function() {
        window.removeEventListener('load', mainEventListener, false);
        
        // only activate on mobile chat
        if (!$('body.mob').length) {
            return;
        }
        
        $('#input').keydown(function(e) {
            if (e.keyCode == 13 && !e.shiftKey) {
                $('#sayit-button').click();
                e.preventDefault();
            }
        });
    }
};

var mainEventListener = Program.main.bind(Program);

window.addEventListener('load', mainEventListener, false);
})();