Fix ZCLCommandButtonMetadata.kwargs to factory=frozendict
#1685
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Before this change,
default=frozendictwould set thefrozendictclass itself forkwargs.However, as we'll only use
ZCLCommandButtonMetadatawhencommand_buttonis called, which defaults tofrozendict()forkwargs, the issue didn't manifest itself.Still, we should fix this, either by doing
default=frozendict()orfactory=frozendict. As this default will never be really used and we already usefactoryforconstant_attributes, I also went with that.With
default=frozendict(), we'd have the same instance for allZCLCommandButtonMetadata. Withfactory, a new one for each. To us, this doesn't really matter, but see the other points I made 😄