compiler: lambda: accurate determination of need-frame.

* share/txr/stdlib/compiler.tl (comp-lambda): The local
variable need-frame is supposed to indicate whether the
lambda needs a frame for its arguments: i.e. whether it has
any parameters. However the way it is calculated is poor:
the fixed-pars list potentially includes the semicolon
symbol : which separates the required parameters from
optionals. Hence the parameter list syntax (:) will be
treated as "needs frame", even though it denotes an empty
parameter list, just like the syntax (). This slight flaw
is now tightened up.

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