make typedesc arg of `init` procs not require generic param#674

A fix to https://github.com/nim-lang/Nim/issues/24688 could imply that typedesc args with types like `Foo[T]` should not match a type `Foo`, especially if the `T` is inferred. `init` procs are usually called as such i.e. `init(ctx, NetName)`, so their parameters are given a type `typedesc[NetName]` rather than `typedesc[NetName[T]]`. Hopefully this is not too much of an incompatibility.