Fix random widget getting displayed after adding a widget

Once the lazygrid gets big enough to overscroll, adding a widget
ends up rendering a random view of another widget in the grid.
A tentative fix is to remove the `onReset` to always recompose
the view, though this makes the performance worse.

Bug: b/311319994
Test: manual
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Change-Id: Ie39276e6ee4ab0d9dc8a3077c3201a529e0df4f9