[unicode-2] whitespace-auto-cleanup always replaces leading spaces with tabs

[Braden McDaniel]

I'm using the emacs-unicode-2 branch. After a recent update of my 
working copy, whitespace-auto-cleanup replaces sequences of 8 spaces in 
leading whitespace with tabs. It does this even though indent-tabs-mode, 
whitespace-check-leading-whitespace, and 
whitespace-check-indent-whitespace are all nil.

I am of the mind that having indent-tabs-mode set to nil should be 
sufficient to disable this behavior.

Braden