idl: Fix instructions with tuple parameters not producing an error

[acheroncrypto]

Problem

Tuples are not currently supported in the IDL, but using them in instruction parameters do not produce an error as described in #3127.

Summary of changes

Fix instructions with tuple parameters not producing an error during IDL generation.

Example error output:

error: Unsupported type
  --> programs/x/src/lib.rs:11:52
   |
11 |     pub fn test<'info>(ctx: Context<Test>, tuple: (u8, u64)) -> Result<()> {
   |                                                   ^^^^^^^^^

Resolves #3127

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