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AboutDlg: Deprecate ctor w/ removed use_header_bar

Daniel Boles requested to merge dboles/aboutdialog-use_header_bar-removed into master

In GTK4, AboutDialog does not inherit from Dialog, and it does not add a :use-header-bar property of its own, so the only effect is this warning:

** (process:12100): WARNING **: 21:37:20.103:
Glib::ConstructParams::ConstructParams(): object class
"gtkmm__GtkAboutDialog" has no property named "use-header-bar"

Mark this constructor as deprecated to match.

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