High order functions not being tested in `test_repeat_as_vector`

[bbbales2]

Description

This is calling the first order gradients three times in a row:

calculate_gradients_1storder(multiple_gradients1, multiple_lp, x1);
calculate_gradients_1storder(multiple_gradients2, multiple_lp, x1);
calculate_gradients_1storder(multiple_gradients3, multiple_lp, x1);

It is comparing against this:

double single_lp = calculate_gradients_1storder(single_gradients1, logprob, s1);
calculate_gradients_2ndorder(single_gradients2, logprob, s2);
calculate_gradients_3rdorder(single_gradients3, logprob, s3);

Current Version:

v3.3.0

[bbbales2]

Fixed in #2042