Fix warning

Author: blackbeam

derive/src/from_row/structs/mod.rs

@@ -288,6 +288,7 @@ mod tests {
         let code = r#"
             #[derive(FromRow)]
             #[mysql(crate_name = "mysql_common")]
+            #[mysql(allow_suboptimal_repr)]
             struct Foo {
                 r#type: u64,
             }