Alternate fix to delete queries with aliases.

I goofed on the last set of changes and mainlined a MySQLism. Since we
don't support joins in delete queries, and database vendors either don't
support aliases in delete queries (sqlite) or support them in different
ways (mysql, postgres, sqlserver) it is simpler to manipulate queries
before they are rendered removing table and condition aliases.
Fix failing tests and PHPCS errors.
Fixed CS error
Merge pull request #4233 from cakephp/3.0-delete-alias

Alternate fix to delete queries with aliases.