activepatch returns df with MultiIndex instead of the expected DatetimeIndex

[lochhh]

aeon_mecha/aeon/analysis/utils.py

Line 143 in 616155b

return in_wheel.groupby(epochs).apply(lambda x: x.cumsum()) > 0

Since pandas version 2.0.0: group_keys now defaults to True. By default group keys are not included when the result’s index (and column) labels match the inputs, but in this case, the result has MultiIndex([(0, '2021-06-21 08:00:40.888351917')...]), rather than DatetimeIndex(['2021-06-21 08:00:40.888351917',...]) of the input, so we need to specify group_keys=False.