Examples don't set sort direction in initial sort column setup.

In the demos table-common.js init method you set the initially sorted column, but not the direction. If you change default direction on the component to 'desc' you have to click on sort twice to get an ascending sorting. Because the `ascending` property on the column defaults to true.

Adding this to the init method fixes it, but don't know if it that's how it meant to be set.

```diff
init() {
this._super(...arguments);

let table = new Table(this.get('columns'), this.get('model'), { enableSync: this.get('enableSync') });
let sortColumn = table.get('allColumns').findBy('valuePath', this.get('sort'));

// Setup initial sort column
if (sortColumn) {
sortColumn.set('sorted', true);
+ sortColumn.set('ascending', this.get('dir') === 'asc' ? true : false)
}

this.set('table', table);
},
```