Deleted the unused li_attr files.

Deleted the unused li_attr files.

<joseph_> I can't find any references to li_attr.tt2 in any source files (using grep) does this mean it isn't used, or are we doing some kind of dynamic loading?
<tsbere> Hmmm. Could be an old config interface that would have been linked via the staff client.
<tsbere> Not sure
<joseph_> It is weird, because it is a tt2 file...
<tsbere> Sometimes a tt2 file is referenced without the .tt2 when linked to, compared to included.
<senator> i can vouch for the unusedness of that file
<senator> it's old cruft
<joseph_> Ah, that looks like it may have done it.
<joseph_> senator, thanks. :) I'll probably get rid of it then.
<denials> cruft_removal++