Improve semantics of orphaned form elements such as buttons

I’ve added the form attribute and set the type attribute to “submit” to the Log In button.

https://github.com/discourse/discourse/commit/8c91d418ddc240cf6f1faf3561c140b1bdbce130

@jxpx777 is it enough or do I need to make Log In a child element of the <form>?

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