Revert auto-scroll changes that are no longer needed.

Revert "Only Jelly Bean seems to have the auto-scroll issue"

This reverts commit a3802a7a.

Revert "Hack around WebView's initial auto-scrolling past the message header"

This reverts commit 8dcc769c.

Conflicts:

	src/com/fsck/k9/view/MessageWebView.java