Use `H160` format for Address selection in v6

[AlexD10S]

Reported by a user on Telegram.

When using a smart contract like the following:

#[ink(storage)]
    pub struct TestContract {
        name: String,
        dao_address: Address,
    }

    impl TestContract {
        #[ink(constructor)]
        pub fn new(name: String,  dao_address: Address>) -> Self {
            Self { name, dao }
        }

In version 6, when trying to input an address, the UI shows a list of Address entries, but not in the H160 format expected by v6. This results in an error: Contract reverted:

Fix

Display the list of available addresses in H160 format, similar to how it was handled in v5.