fix(pb-grid): Fix calling pb-grid#addPanel(0)

[DrRataplan]

It should open panel number 0 and not default to opening the 'next' panel like the argument is omitted

[github-actions[bot]]

:tada: This PR is included in version 2.24.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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