Add listeners for default visibility options in quick-edit.

[sybrew]

In Post Edit, we dynamically adjust the canonical URL and indexing states when the user interacts with the editor's interface.

For example, if a post gets password protection, we set the default indexing state to "noindex."
At the same time, when a post is set to "noindex," we remove the canonical URL placeholder.

When the slug changes, we also dynamically adjust the canonical URL.