[w3c/selection-api] Fix selectAllChildren to use child count (#136)

It matches the actual browser behavior.

Closes #125 

The following tasks have been completed:

 * [x] Modified Web platform tests (link to pull request): Already written as such https://github.com/web-platform-tests/wpt/blob/7b0ebaccc62b566a1965396e5be7bb2bc06f841f/selection/selectAllChildren.html#L53

Implementation commitment:

 * [x] WebKit https://webkit-search.igalia.com/webkit/rev/267a25a31211b30330b892dafd40b1ecf8c69505/Source/WebCore/page/DOMSelection.cpp#443
 * [x] Chromium https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/editing/dom_selection.cc;l=755?q=Selection::SelectAllChildren
 * [x] Gecko https://searchfox.org/mozilla-central/rev/2c991232499e826e46f9d976eb653817340ba389/dom/base/Selection.cpp#2675


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/136

-- Commit Summary --

  * Fix selectAllChildren to use child count

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/selection-api/pull/136.patch
https://github.com/w3c/selection-api/pull/136.diff

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https://github.com/w3c/selection-api/pull/136