BrightnessSlider: restart the effect when overriddenByAppState changed

add overridenByAppStete into LaunchedEffect's key list
to fix the brightness warning toast didn't popup when CL [1] introduced
the new brightness UX because when recomposing BrightnessSlidler by
swiping the slider but didn't restart the effect while
overriddenByAppState was changed but LaunchedEffect doesn't know abot
this change.

[1]: I56af0a5b5666d39578bf61f59b7d2ec09441f2a5

Fix: 412076346
Flag: EXAMPT bug fix
Test: atest -d PlatformScenarioTests:SwipeBrightnessShowToast
Change-Id: Id3cb4a491503780216f707f79fedf0c1854c7722