tests: sendkeys: Fix `{enter}` keypress event

src/tests/frontend/lib/sendkeys.js

@@ -426,8 +426,8 @@ $.fn.sendkeys.defaults = {
   '{enter}': function (rng){
     rng.insertEOL();
     rng.select();
-    var x = '\n'.charCodeAt(0);
-    $(rng._el).trigger({type: 'keypress', keyCode: x, which: x, charCode: x});
+    $(rng._el).trigger(
+        {type: 'keypress', keyCode: 13, which: 13, charCode: 13, code: 'Enter', key: 'Enter'});
   },
   '{backspace}': function (rng){
     var b = rng.bounds();

src/tests/frontend/specs/change_user_color.js

@@ -89,7 +89,6 @@ describe('change user color', function () {
     $chatButton.click();
     const $chatInput = chrome$('#chatinput');
     $chatInput.sendkeys('O hi'); // simulate a keypress of typing user
-    // simulate a keypress of enter actually does evt.which = 10 not 13
     $chatInput.sendkeys('{enter}');
 
     // wait until the chat message shows up