Fix Signal#ap bug in getAndDiscreteUpdates
#3206
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Fixes a bug where
getAndDiscreteUpdatesfor aSignalcreated viaSignal#apwas not emitting updates until both of its upstream signals emitted at least one change.The new implementation delegates to
getAndDiscreteUpdatesof the upstream signals, which both simplifies it and will be more performant forSignals that override that method.h/t @noelwelsh for reporting in creativescala/gooey@34173c6