Classic: Fix the right analog stick on the Classic Controller

The right analog stick has half the precision of the left stick on the
wire. This was a simple copy/paste error when converting everything from
the templated code elsewhere.
Well, it's not the "C stick" on classic controllers, it's just the "right analog stick". I don't really think adding names for this will make the code clearer. I could point add a comment saying with a link to http://wiibrew.org/wiki/Wiimote/Extension_Controllers/Classic_Controller , and add that the range of the right analog stick is half of the left, for no discernible reason.