Remove action that is no longer true.

[dwsteele]

0c786661 changed behavior such that log_statement = all is only set when set_user.block_log_statement = on and rolename is a database superuser. README.md was updated to match but part of a sentence was left behind and e911f628 restored the deleted text apparently thinking it was an accidental deletion rather than an incomplete deletion.

This commit honors the original intent of 0c786661 by removing the action that is no longer true.