[web] Corner radius is interpreted differently than the mobile platforms

[Tiagoperes]

Description

It seems like the corner radius accepts a diameter in web, while it accepts a radius in mobile platforms. We should check what really is going on and, if this is the case, multiply the value by 2 before assigning it to a web component.

Steps To Reproduce

Check the image below:

Expected Results

Considering the example above, I expected all platforms to render a circle.