Split Cub200 into more the five experiences.

[evertonaleixo]

🐛 Describe the bug
I am trying to split cub200 benchmark into 10 experiences, however, it is giving the following error:

'''
File ~\playground\avalanche\avalanche\benchmarks\scenarios\new_classes\nc_scenario.py:277, in NCScenario.init(self, train_dataset, test_dataset, n_experiences, task_labels, shuffle, seed, fixed_class_order, per_experience_classes, class_ids_from_zero_from_first_exp, class_ids_from_zero_in_each_exp, reproducibility_data)
270 remaining_exps = n_experiences - len(per_experience_classes)
271 if (
272 remaining_exps > 0
273 and (self.n_classes - sum(per_experience_classes.values()))
274 % remaining_exps
275 > 0
276 ):
--> 277 raise ValueError(
278 "Invalid number of experiences: remaining "
279 "classes cannot be divided by n_experiences"
280 )
282 # default_per_exp_classes is the default amount of classes
283 # for the remaining experiences
284 if remaining_exps > 0:

ValueError: Invalid number of experiences: remaining classes cannot be divided by n_experiences
'''

🐜 To Reproduce
A minimal working example to reproduce the issue. The code should be executable without modifications.
'''
split_ds = SplitCUB200(
n_experiences=10,
seed=1234,
)
'''

🐝 Expected behavior
A clear and concise description of what you expected to happen.
Create 10 experiences,

🐞 Screenshots
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🦋 Additional context
Add any other context about the problem here like your python setup.