Update rust/ql/test/query-tests/security/CWE-089/mysql.rs

Co-authored-by: Simon Friis Vindum <paldepind@github.com>

Author: geoffw0

rust/ql/test/query-tests/security/CWE-089/mysql.rs

@@ -112,7 +112,7 @@ mod async_test
 
 fn main() {
     println!("test_mysql...");
-    match (sync_test::test_mysql("")) {
+    match sync_test::test_mysql("") {
         Ok(_) => println!("  successful!"),
         Err(e) => println!("  error: {}", e),
     }