Display area slides after pagenation enabled while list runnning.

**Describe the bug**
I added items to list while list model running.
Then, display area slides 1 line to upper.
Selected item (or once selected items) is displayed properly.

**Setup**
Please complete the following information along with version numbers, if applicable.
- WSL on Windows11
- fish and bash
- Windows terminal
- en_US.UTF-8

**To Reproduce**
I little modify `bubbletea/example/list-sample/main.go`.
This program appends items each 1 seccond.
When items overflow a page, the display area slides.

**Source Code**
This not run on go playground.
https://go.dev/play/p/RLjPz27-lxx

**Expected behavior**
Display area will not slide, and index will saved each additions.

**Screenshots**