Fmt: remove trailing blanck line

Author: RungeCC

test/function_traits_test.cpp

@@ -536,4 +536,4 @@ TEST(Function_Traits, Const_Volatile_RRef_Noexcept_Variadic)
     EXPECT_TRUE((is_rvalue_ref_fn_v<T> == true));
     EXPECT_TRUE((is_noexcept_fn_v<T> == true));
     EXPECT_TRUE((is_c_variadic_fn_v<T> == true));
-}
+}