prettify/simplify psql statements for `Using non-default schema` scenario

[jf]

• simplify the CREATE SCHEMA statements (no need to repeat the schema name if AUTHORIZATION is the same
• prettify horizontal alignment (yeah sorry about the commit message; it's horizontal, not vertical!) so that it's easier (IMO) to see what's going on

(For the record, I did confirm with the pg docs (15 onwards) that this way of specifying CREATE SCHEMA works where you do not need to separately specify the schema name if the authorization is the same value (search for Create a schema for user joe; the schema will also be named joe:))

[jeremyevans]

Looks good, thanks for the patch!