Avoid duplicate down stream emits

Making the shared flow Eagerly to avoid a second down stream flow emit
from subcribing to the upstream flow (the first time is from the cached
replay value)

Test: Manually log that there's only one emit when returning to the main
      screen from the clock settings screen
Bug: 289288356
Change-Id: Icf815f19a95e264d1141ec0f6e1d078aec8eb147