Werk #7424: mk_postgres: add missing database parameter

The mk_postgres plugin was missing a database parameter in the queries for the checks postgres_bloat and postgres_stats. Therefore, the name of the database user was used as a fallback. As a result no output for postgres_stats and postgres_bloat was returned if a database with the username did not exist. If a database with the username exists the checks give the correct output.

To resolve the issue the fixed version of the mk_postgres plugin has to be deployed on the affected hosts.

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