Remove observing offset in composition

Instead, use derived state as it can cause extra unneeded recompositions

Test: manual
Test: PagerDotsScreenshotTest
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Bug: 369156081
Change-Id: Id298c00f1943954e99c7362e1913d6b28f4af374
1 file changed