Fix DB privilege check for database names containing _ or %

[leeclemens]

Fixes the DB privilege check failing for database names with _ or %. The schema_privileges queries escaped the db name (_ → _) before an = comparison — escaping only works with LIKE, so it
never matched. Bind the raw name instead, consistent with the table_privileges query right below.

refs #5521

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[leeclemens]

Signed, not sure which option to click on the generic Contact Us page.

[bobapple]

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