Cleanup NestedScrollSource.Drag usages

Drag and UserInput are exactly the same

```kotlin
/** Dragging via mouse/touch/etc events. */
@Deprecated(
    "This has been replaced by UserInput.",
    replaceWith =
        ReplaceWith(
            "NestedScrollSource.UserInput",
            "import androidx.compose.ui.input.nestedscroll." +
                "NestedScrollSource.Companion.UserInput"
        )
)
val Drag: NestedScrollSource = UserInput
```

Test: No tests
Bug: 371984715
Flag: com.android.systemui.scene_container
Change-Id: Iac0324f863c52273b9e72392a4168e78a7008685