user-accounts: Explicitly initialize CcAvatarChooser
Setting the Gtk.MenuButton.popover property to a CcAvatarChooser object doesn't initialize the CcAvatarChooser object.
Fixes #1689 (closed)
Setting the Gtk.MenuButton.popover property to a CcAvatarChooser object doesn't initialize the CcAvatarChooser object.
Fixes #1689 (closed)