[grid] Select All checkbox appears in selected state on empty grid

[vursen]

Description

Expected outcome

The "Select All" checkbox should be hidden when the grid is empty

Minimal reproducible example

<script type="module">
  import '@vaadin/grid/all-imports';
</script>

<vaadin-grid item-id-path="name">
  <vaadin-grid-selection-column select-all></vaadin-grid-selection-column>
  <vaadin-grid-column path="name"></vaadin-grid-column>
</vaadin-grid>

Environment

Vaadin version(s): 24.5 and earlier
OS: Mac OS