fix(rasn): correctly bind nested list item constraints

[6d7a]

No description provided.

[DavidLeeds]

@6d7a thank you for the bug fix! As a follow-up, would it be possible to eliminate the additional wrapper struct for anonymous SEQUENCE OF SEQUENCE? For example:

Go from:

        #[doc = " Anonymous SEQUENCE OF member "]
        #[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
        #[rasn(delegate, value("1..=5"), identifier = "INTEGER")]
        pub struct AnonymousTicketAges(pub u8);
        #[doc = " Inner type "]
        #[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
        #[rasn(delegate)]
        pub struct TicketAges(pub SequenceOf<AnonymousTicketAges>);
        #[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
        #[rasn(automatic_tags)]
        pub struct Ticket {
            pub ages: TicketAges,
            pub passenger: Option<Passenger>,
        }

To:

        #[doc = "Ticket::ages SEQUENCE OF element"]
        #[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
        #[rasn(delegate, value("1..=5"), identifier = "INTEGER")]
        pub struct TicketAgesElement(pub u8);
        #[derive(AsnType, Debug, Clone, Decode, Encode, PartialEq, Eq, Hash)]
        #[rasn(automatic_tags)]
        pub struct Ticket {
            pub ages: SequenceOf<TicketAgesElement>,
            pub passenger: Option<Passenger>,
        }

This would reduce a significant amount of boilerplate code for complex ASN.1.