cy.viewport() iPad preset orientation's landscape and portrait are inversed

The following command sets the screen size to `768` height and `1024` width. An ipad2 in portrait should have `1024` height and `768` width.

```
cy.viewport("ipad-2", "portrait")
```

The following command sets the screen size to `1024` height and `768` width. An ipad2 in landscape should have `768` height and `1024` width.

```
cy.viewport("ipad-2", "landscape")
```
