small fix manage unit target

[Ipuch]

very small fix to handle the plot when there is a target with only one value.

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This change is 

[pariterre]

Reviewed all commit messages.
Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @Ipuch and @pariterre)

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bioptim/optimization/optimal_control_program.py line 726 at r1 (raw file):

            if penalty.target is not None and isinstance(t, int):
                _target = (
                    penalty.target[..., penalty.node_idx.index(t)]

There is a for loop missing for "all the targets"

Code quote:

                    penalty.target[..., penalty.node_idx.index(t)]
                    if len(penalty.target) > 1
                    else penalty.target[penalty.node_idx.index(t)]

[pariterre]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Ipuch)