Calc: fix autoload errors (bug#40800)

Calc: fix autoload errors (bug#40800)

Reported by Hugo Daschbach.

* lisp/calc/calc-ext.el (calc-init-extensions):
Remove calc-kbd-report key binding and autoload; it was removed in 2005.
calc-keypad-x-{left,right,middle}-click were renamed to
calc-keypad-{left,right,middle}-click in 2001; fix the autoloads.
calc-twos-complement-mode is a variable, not a function; remove the
autoload.
* lisp/calc/calc-prog.el: Remove commented-out calc-kbd-report.