Avoid parsing HTML when creating <input> nodes

Avoid parsing HTML when creating <input> nodes

We used to create them like $( '<input type="checkbox" />' ), which
actually does HTML parsing under the hood, because on IE 8 and lower
trying to change the 'type' of an <input> node throws an exception.
But we dropped support for IE 8 recently and no longer need to do that.

Upstream change for OOjs UI is I166f5ab0dce5ab47dc6a1f4e2e5ad012635911ed.

Find:         \$\( '<input type="(\w+)" ?/?>' \)
Replace with: $( '<input>' ).attr( 'type', '\1' )

Change-Id: Ie86f8917e8ce100de22006516daa542ad178aab6