chore(tests): update stale compile_fail snapshot for has_many_no_as_for_self

[remysaissy]

Summary

The trybuild snapshot for has_many_no_as_for_self.rs was stale: the expected stderr contained the type must implement 'Default' but the current Rust compiler emits cannot satisfy '_: Default'.

Updated the snapshot to match current compiler output so cargo test -p lorm-macros --test compile_fail passes again.

Test results

test result: ok. 1 passed; 0 failed (lorm-macros --test compile_fail, was failing before)

[remysaissy]

Closing: the snapshot mismatch only occurs with the local Rust 1.92 toolchain. CI's stable Rust still emits the original text, so no change is needed.