Phase B fixup: run nightly rustfmt on regenerated Rust types

Codegen-check CI complained because the local fmt I ran when re-running
codegen used stable rustfmt; the verification workflow uses the nightly
toolchain plus the nightly-only .rustfmt.nightly.toml config (see
.github/workflows/rust-sdk-tests.yml). Re-run nightly fmt to match.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

rust/src/generated/api_types.rs

@@ -10,8 +10,7 @@ use super::session_events::{
     AbortReason, McpServerSource, McpServerStatus, PermissionPromptRequest, PermissionRule,
     ReasoningSummary, SessionMode, ShutdownType, SkillSource, UserToolSessionApproval,
 };
-use crate::types::SessionEvent;
-use crate::types::{RequestId, SessionId};
+use crate::types::{RequestId, SessionEvent, SessionId};
 
 /// JSON-RPC method name constants.
 pub mod rpc_methods {