bug fix for CoilCurrentLength

[ddudt]

The output of CoilCurrentLength is a 2D array of shape (dim_f, dim_f), this corrects it to be a 1D array of shape (dim_f,).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.24%. Comparing base (b15a24f) to head (777d4ea).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1146      +/-   ##
==========================================
- Coverage   95.24%   95.24%   -0.01%     
==========================================
  Files          87       87              
  Lines       21947    21947              
==========================================
- Hits        20904    20903       -1     
- Misses       1043     1044       +1     

Files	Coverage Δ
desc/objectives/_coils.py	99.14% <100.00%> (ø)

... and 1 file with indirect coverage changes

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     +0.07 +/- 8.32     | +3.81e-04 +/- 4.46e-02 |  5.36e-01 +/- 3.7e-02  |  5.36e-01 +/- 2.5e-02  |
 test_build_transform_fft_midres         |     -3.29 +/- 5.59     | -2.05e-02 +/- 3.48e-02 |  6.03e-01 +/- 2.7e-02  |  6.23e-01 +/- 2.2e-02  |
 test_build_transform_fft_highres        |     -4.33 +/- 5.71     | -4.52e-02 +/- 5.96e-02 |  9.99e-01 +/- 3.0e-02  |  1.04e+00 +/- 5.2e-02  |
 test_equilibrium_init_lowres            |     +3.22 +/- 6.97     | +1.22e-01 +/- 2.63e-01 |  3.89e+00 +/- 2.1e-01  |  3.77e+00 +/- 1.6e-01  |
 test_equilibrium_init_medres            |     +4.04 +/- 6.07     | +1.71e-01 +/- 2.57e-01 |  4.40e+00 +/- 2.4e-01  |  4.23e+00 +/- 9.0e-02  |
 test_equilibrium_init_highres           |     -0.41 +/- 3.70     | -2.35e-02 +/- 2.11e-01 |  5.66e+00 +/- 1.6e-01  |  5.68e+00 +/- 1.4e-01  |
 test_objective_compile_dshape_current   |     -1.91 +/- 1.69     | -7.57e-02 +/- 6.70e-02 |  3.88e+00 +/- 4.8e-02  |  3.95e+00 +/- 4.7e-02  |
 test_objective_compile_atf              |     +0.11 +/- 2.50     | +9.62e-03 +/- 2.12e-01 |  8.48e+00 +/- 2.0e-01  |  8.47e+00 +/- 7.0e-02  |
 test_objective_compute_dshape_current   |     -0.99 +/- 5.28     | -1.25e-05 +/- 6.66e-05 |  1.25e-03 +/- 3.4e-05  |  1.26e-03 +/- 5.8e-05  |
 test_objective_compute_atf              |    -14.52 +/- 6.26     | -7.18e-04 +/- 3.09e-04 |  4.23e-03 +/- 1.5e-04  |  4.94e-03 +/- 2.7e-04  |
 test_objective_jac_dshape_current       |     -5.02 +/- 10.95    | -1.99e-03 +/- 4.33e-03 |  3.76e-02 +/- 1.8e-03  |  3.96e-02 +/- 3.9e-03  |
 test_objective_jac_atf                  |     -1.97 +/- 4.71     | -3.75e-02 +/- 8.98e-02 |  1.87e+00 +/- 4.6e-02  |  1.91e+00 +/- 7.7e-02  |
 test_perturb_1                          |     +0.78 +/- 2.85     | +1.08e-01 +/- 3.97e-01 |  1.41e+01 +/- 1.6e-01  |  1.40e+01 +/- 3.6e-01  |
 test_perturb_2                          |     +0.90 +/- 5.52     | +1.72e-01 +/- 1.05e+00 |  1.92e+01 +/- 5.0e-01  |  1.90e+01 +/- 9.2e-01  |
 test_proximal_jac_atf                   |     +1.40 +/- 1.42     | +1.02e-01 +/- 1.04e-01 |  7.42e+00 +/- 8.1e-02  |  7.32e+00 +/- 6.4e-02  |
 test_proximal_freeb_compute             |     -0.86 +/- 1.14     | -1.53e-03 +/- 2.04e-03 |  1.78e-01 +/- 1.7e-03  |  1.79e-01 +/- 1.2e-03  |
 test_proximal_freeb_jac                 |     +0.38 +/- 2.13     | +2.85e-02 +/- 1.60e-01 |  7.57e+00 +/- 1.0e-01  |  7.54e+00 +/- 1.2e-01  |
 test_solve_fixed_iter                   |     +0.21 +/- 6.82     | +3.79e-02 +/- 1.25e+00 |  1.83e+01 +/- 8.7e-01  |  1.83e+01 +/- 8.9e-01  |