This PR changes the behavior of `brightness` module if an effect is
active.
Currently, changing the brightness disables the effect when the
brightness is changed, this fixes that.
This will also improve the `set_effect` interface to use the current
brightness when an effect is activated.
* light_strip_effect: passing `bAdjusted` with the changed properties
changes the brightness.
* light_effect: the brightness is stored only in the rule, so we modify
it when adjusting the brightness. This is also done during the initial
effect activation.
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Co-authored-by: Steven B <51370195+sdb9696@users.noreply.github.com>
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