Testing: Remove condition from 'autosave' e2e test

[Mamaduka]

The autosave e2e test contains conditional assertion, which needs to be fixed and removed. See #58171 (comment).

Details

Occasionally, upon reload, no server-provided autosave value is available despite having previously explicitly autosaved. The reasons for this are still unknown. Since this is unrelated to local autosave, until we can understand them, we'll drop this test's expectations if we don't have an autosave object available.

Possible causes

• The edit-form-blocks.php file has a condition that will delete autosave before the editor is loaded. However, I couldn't reproduce it in a controlled environment for debugging.