[Dev] CTModels warning

check this warning during tests (probably issued by CTModels)

```julia
Line 7: x₁(t) + u(t) == [1, 2]
┌ Warning: Overwriting bound for component 1 (label: label##6844). Previous value will be discarded. Note: dual variable dimension equals the state/control/variable dimension, not the number of constraints.
```