expander: bugfix: fixed params visible to optionals.

* eval.c (expand_params_rec): Add the parameter to the macro-time
environment before processing rest of parameter list. This is
already done for all the symbols of a macro-style
destructuring; just not for a simple parameter.  This is
necessary, because the init forms of optional parameters occur
in a lexical environment in which prior parameters are
visible. The test case for this is that (lambda (x : (y x)))
must not produce a warning about unbound x.

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