[rust]: fix some unuse warniings

frontend/rust-lib/lib-dispatch/src/request/request.rs

@@ -17,6 +17,7 @@ use std::{
 
 #[derive(Clone, Debug, Derivative)]
 pub struct EventRequest {
+    #[allow(dead_code)]
     pub(crate) id: String,
     pub(crate) event: Event,
     #[derivative(Debug = "ignore")]

frontend/rust-lib/lib-sqlite/src/pool.rs

@@ -101,6 +101,7 @@ pub struct DatabaseCustomizerConfig {
     pub(crate) journal_mode: SQLiteJournalMode,
     pub(crate) synchronous: SQLiteSynchronous,
     pub(crate) busy_timeout: i32,
+    #[allow(dead_code)]
     pub(crate) secure_delete: bool,
 }