Fix transfer-sol: use crate::ID instead of id() in instruction module

When instruction handlers were extracted from lib.rs into their own files,
the id() function (which refers to declare_id!()) is no longer in scope.
Use crate::ID to reference the program ID from a nested module.

Author: mikemaccana-edwardbot

basics/transfer-sol/anchor/programs/transfer-sol/src/instructions/transfer_sol_with_program.rs

@@ -5,7 +5,7 @@ pub struct TransferSolWithProgram<'info> {
     /// CHECK: Use owner constraint to check account is owned by our program
     #[account(
         mut,
-        owner = id() // value of declare_id!()
+        owner = crate::ID // value of declare_id!()
     )]
     payer: UncheckedAccount<'info>,
     #[account(mut)]