REST API: Remove redundant parent_post_type property from template autosaves controller

[Soean]

The WP_REST_Template_Autosaves_Controller class redeclared a private $parent_post_type property and assigned it in its constructor. Both were dead code. The parent class WP_REST_Autosaves_Controller already declares and sets this property, and because it is declared private, the child class's copy could never be accessed by the parent's methods, nor was it ever read anywhere within the child class itself. The result was confusing property shadowing without any functional purpose.

This change removes the duplicate property declaration and the corresponding assignment in the constructor. Since the property was never read in the child class and was effectively a separate, unused storage slot, there is no change in runtime behavior.

Trac ticket:

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