Issue #1879200 by pcambra, swentel, Berdir: Remove uneeded argument from entity type callbacks.

core/lib/Drupal/Core/Entity/ContentEntityBase.php

core/lib/Drupal/Core/Entity/Entity.php

...dules/system/tests/modules/entity_test/entity_test.module

core/modules/user/lib/Drupal/user/Entity/User.php

core/modules/user/user.module