Enable `elementpath` for the Classic Block TinyMCE editor

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So far, the Classic Block renders the TinyMCE editor within the WordPress Editor canvas. In this case, disabling the TinyMCE elementpath makes perfectly sense, as it would be perceived as an extraneous I element, in this context. For this reason, elementpath is explicitly disabled in the TinyMCE settings, see ​https://github.com/WordPress/wordpress-develop/blob/d744c4d39729e2f1df76d93d99560d791ece3043/src/wp-includes/class-wp-editor.php#L933

See first screenshot for the current state.

However, on latest Gutenberg, the Classic Block opens a modal dialog. The TinyMCE editor renders within the modal dialog. In this context, there's no reason to disable elementpath. The elements path shown in the TinyMCE status bar is a useful tool that helps users with selecting the elements within the editor.

Currently, the status bar shows ad the bottom of the editor, but it's empty. See second screenshot.

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Current state: rendered in the editor canvas with no status bar and no elements path.

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Latest Gutenberg: rendered within a modal dialog with empty status bar and no element path.

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Screenshot with patch applied.

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One more place where this change will restore the elements path is the Text widget in the 'Classic' Widgets page and wherever plugins / themes initialize TinyMCE by using wp_enqueue_editor().

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The Text widget in the 'Classic' Widgets page, before and after.