Bugfix: Make 'static member val' possible in a type without any constructor at all

[T-Gro]

This fixes #16297
Before, it was failing with 'member val' definitions are only permitted in types with a primary constructor. Consider adding arguments to your type definition, e.g. 'type X(args) = ...'.

Curiously, things started to work if the auto property was declared only after a 'static let' or a 'static do', even an empty 'static do ()' worked.

This bugfix eliminated the need to put in dummy static let/do and makes static autoproperty work

type T =
    //static let x = 42   <--- if a 'static let' or 'static do' were here first, everything worked
    static member val P = 1 with get,set   // <-- if this was the first member, it failed 

The error message remains in place for instance auto properties ('member val' without static).
Types without constructors are codegen'd as static, therefore instance auto property does not make sense.