Table properties button is disabled in the table toolbar

[Mgsy]

📝 Provide detailed reproduction steps (if any)

• Add the following configuration to the editor that includes Table properties (e.g. all-features manual test):

table: {
   contentToolbar: [
      'tableColumn', 'tableRow', 'mergeTableCells', 'tableCellProperties'
   ],
   tableToolbar: [ 'tableProperties', 'toggleTableCaption' ]
}

• Insert the table.
• Select the table using the table handler.
• Try to click on the table properties button.

✔️ Expected result

It's possible to open the table properties form.

❌ Actual result

The button is disabled.

Other details

• The button is enabled on the nested tables, however, there is another issue with this setup - Table properties are applied to the outer table while using it with the table toolbar on a nested table  #15041.

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