idl: Fix using account or arg values for seeds::program

[acheroncrypto]

Problem

Passing an account or an argument to seeds::program results in a compile error.

For example, using the following accounts struct:

#[derive(Accounts)]
pub struct Test<'info> {
    #[account(
        seeds = [b"*"],
        seeds::program = some_program,
        bump
    )]
    pub pda: UncheckedAccount<'info>,
    pub some_program: Program<'info, System>,
}

and running anchor idl build results in:

error[E0425]: cannot find value `some_program` in this scope
  --> programs/program/src/lib.rs:20:26
   |
20 |         seeds::program = some_program,
   |                          ^^^^^^^^^^^^ not found in this scope

Dynamic values are generally not supported, but we have a few exceptions for accounts and arguments. Given this kind usage already works for regular seeds, it should also work for seeds::program.

Summary of changes

Fix being unable to use account or argument values for seeds::program during IDL generation.

Fixes #3471

[vercel]

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