[BottomSheet] Bottom insets are cut when paddingTopSystemWindowInsets is set to false

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**Description:**

When application is in edge-to-edge mode, I need the standard `BottomSheet` with scrollable content to satisfy the following:
1. Do not reach the top system bar when fully scrolled
2. Have content shifted at the bottom by the bottom system bar height
3. Have no need for the extra scroll when content is not scrollable

To achieve that I use the following combination of the insets params:
- `app:paddingBottomSystemWindowInsets="true"` - to shift the content from the bottom
- `app:paddingTopSystemWindowInsets="false"` - to make it not reach the top system bar. Notice that I tried using the `app:marginTopSystemWindowInsets=true` instead. It works fine with the given case, but doesn't work in generic case. For instance in case of modal sheet with short content you always have to scroll the sheet up by a measure of top margin.

However, when I launch the app and scroll the content fully, the bottom padding is not fully displayed! Instead I see the padding, which is equal to the "bottom bar height" - "top bar height". Also, in layout inspector I can see that bottom padding is rendering out of the window.

See the below screenshots
- [App](https://imgur.com/xkMYsy7)
- [Layout inspector](https://imgur.com/IkoHjym)

**Expected behavior:**

Combination of the `app:paddingBottomSystemWindowInsets="true"` and `app:paddingTopSystemWindowInsets="false"` should work as per documentation, i.e. not let the sheet render under the top bar and at the same time shift content from the bottom by the size of the bottom bar.

**Source code:**

Enable edge rendering mode in activity and use the following layout:

```

```

**Android API version:** Any

**Material Library version:** 1.9.0

**Device:** Pixel 4 API 28

Reproduce the issue with BottomSheetBehavior using the provided CoordinatorLayout, NestedScrollView, and inset attributes in edge-to-edge mode. Start by tracing BottomSheetBehavior's handling of paddingBottomSystemWindowInsets and paddingTopSystemWindowInsets, then verify scrolling with the Pixel 4 API 28 configuration. Done means the full bottom system-bar padding remains visible without reaching the top bar or requiring extra scrolling for short content.

Written by the indexing model from the issue text.