[1/2] twain_32: Add debug traces to TWAIN_UserSelect.

[Vincent Povirk]

> This patch makes the indentation of this function hard to read.  Would
> it be better
> to just reformat this function to be like the reset of the file.

I didn't think we were supposed to change the formatting of existing code.

Then again, this function pretty much needs a complete rewrite so we
can implement a selection dialog.