idl: Fix using full path types with Program

[acheroncrypto]

Problem

#[derive(Accounts)]
pub struct FullPath<'info> {
    pub external_program: Program<'info, external::program::External>,
}

This fails to compile:

error[E0599]: no function or associated item named `id` found for struct `External` in the current scope
   --> programs/new-idl/src/lib.rs:290:10
    |
290 | #[derive(Accounts)]
    |          ^^^^^^^^ function or associated item not found in `External<'_>`
...
377 | pub struct External<'info> {
    | -------------------------- function or associated item `id` not found for this struct
    |
    = help: items from traits can only be used if the trait is implemented and in scope
    = note: the following traits define an item `id`, perhaps you need to implement one of them:
            candidate #1: `SysvarId`
            candidate #2: `anchor_lang::Id`
    = note: this error originates in the derive macro `Accounts` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0599`.
error: could not compile `new-idl` (lib test) due to 1 previous error
Error: Building IDL failed

Summary of changes

Fix using full path types in Program by using the full path of the given account type and the anchor_lang::Id trait.

[vercel]

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