Lexical: Fixed double-bold text, updated tests

Double bold was due to text field exporting wrapping the output in <b>
tags when the main tag would already be strong.

resources/js/wysiwyg/lexical/table/__tests__/unit/LexicalTableSelection.test.ts

@@ -123,6 +123,7 @@ describe('table selection', () => {
       __prev: null,
       __size: 1,
       __style: '',
+      __textFormat: 0,
       __textStyle: '',
       __type: 'paragraph',
     });