Gantt taskRender event does not pass task element

[ExtAnimal]

Simple addition to existing test case in TaskRendering.t.js shows it:

    t.it('Should trigger renderTask and releaseTask', async t => {
        let renderCount = 0, releaseCount = 0;

        gantt = await t.getGanttAsync({
            listeners : {
                renderTask({ element }) {
                    renderCount++;
                    t.ok(element, 'Element passed in renderTask event');
                },

                releaseTask() {
                    releaseCount++;
                }
            }
        });

        const initialRenderCount = renderCount;

        t.diag('Initial render');

        t.is(renderCount, document.querySelectorAll('.b-gantt-task').length, 'Correct render count');
        t.is(releaseCount, 0, 'Correct release count');

        t.diag('Remove task');

        gantt.taskStore.last.remove();

        t.is(renderCount, initialRenderCount, 'Correct render count');
        t.is(releaseCount, 1, 'Correct release count');
    });