Set model to another iteration breaks $getParameterAtIteration() for OptimizerAGBM

[schalkdaniel]

Check:

cboost = boostSplines(iris, "Sepal.Length", loss = LossQuadratic$new(), optimizer = OptimizerAGBM$new())

cboost$model$getEstimatedParameter()
cboost$model$getParameterAtIteration(30)
cboost$model$setToIteration(30, 0)
cboost$model$getEstimatedParameter()
cboost$model$getParameterAtIteration(30)

The parameter do not match.

[schalkdaniel]

To not crash the tests, this is excluded out in test_json.R