Fix formatting: remove extra blank lines in test files

Removed duplicate blank line after serial_test import that was causing
formatting check failures.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: platinummonkey

tests/auth_tests.rs

@@ -1,7 +1,6 @@
 mod common;
 use serial_test::serial;
 
-
 use axum::body::Body;
 use axum::http::{Request, StatusCode};
 use common::*;

tests/label_rating_tests.rs

@@ -1,7 +1,6 @@
 mod common;
 use serial_test::serial;
 
-
 use axum::body::Body;
 use axum::http::{Request, StatusCode};
 use common::*;

tests/schedule_tests.rs

@@ -1,7 +1,6 @@
 mod common;
 use serial_test::serial;
 
-
 use axum::body::Body;
 use axum::http::{Request, StatusCode};
 use common::*;

tests/talk_tests.rs

@@ -1,7 +1,6 @@
 mod common;
 use serial_test::serial;
 
-
 use axum::body::Body;
 use axum::http::{Request, StatusCode};
 use common::*;