Fix OptionValue BAO to call pre/post hooks to prevent force-reset of managed entities

Fix OptionValue BAO to call pre/post hooks to prevent force-reset of managed entities

Managed entities rely on pre/post hooks being called in order to track whether an entity
has been modified. Without those hooks OptionValues were being force-reverted by the
managed system even when the 'update' mode was set to 'unmodified', which is supposed
to defer to user modifications.