- fixed 3132141 -- enter key does not work with input type=image

	Made the logic handle image and submit type inputs in the same way.

        * khtml/html/html_formimpl.h: Remove unused m_clicked flags.
        * khtml/html/html_formimpl.cpp:
        (HTMLButtonElementImpl::HTMLButtonElementImpl): Remove code to set the m_clicked flag.
	The only place this flag was looked at is better handled by the m_activeSubmit flag.
        (HTMLButtonElementImpl::defaultEventHandler): Remove more m_clicked flag code.
        (HTMLInputElementImpl::HTMLInputElementImpl): Remove more m_clicked flag code.
        (HTMLInputElementImpl::isSuccessfulSubmitButton): An image is also a successful submit
	button, and unlike a submit element, it doesn't require a name because it will just submit
        x and y with no name in that case. I suppose we could rename this function, but I think it's
        still a pretty clear name even if not 100% accurate.
        (HTMLInputElementImpl::encoding): Remove use of m_clicked and use m_activeSubmit instead.
	This was the only place using m_clicked at all. Also remove bogus check for a -1 coordinate.
	The coordinate defaults to 0, not -1, and it was never happening.
        (HTMLInputElementImpl::defaultEventHandler): Remove more m_clicked flag code.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3218 268f45cc-cd09-0410-ab3c-d52691b4dbfc