Fix using enter to submit on android (bug 1104105)

This prevent us causing the focus to disapper when using enter to submit in Android.
`nodeName` should always be uppercase [1] (`nodeName` just delegates to `tagName` [2], which might be better to use?). You could do `e.target.nodeName === 'BUTTON'` instead.

[1] http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-104682815
[2] https://developer.mozilla.org/en-US/docs/Web/API/Node.nodeName