[REM] sql_db: legacy useless tests and duplicate exception block

- The test for %f/%d is useless, eveybody has been using %s for
  ages, and the psycopg2 error is pretty explicit if you don't.
  It can introduce a small but useless delay for long queries.
- The duplicate except block was redundant with the generic `except
  Exception` block, with only a different log prefix.

+ the logging for the type testing of `params` was useless too,
raising a error is enough (though that particular test is still
relatively useful because the psycopg2 error isn't very clear
when you mess up the parameters)

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