fix tracker2 reducer for user blocked notification (#21344)
fix tracker2 reducer for user blocked notification (#21344)

* fix tracker2 reducer for user blocked notification

* simpler cast

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client