allow searching for multiple meta terms

[TylerNoblett]

fixes bug where searching for multiple meta terms returned an error

If you searched for two meta terms, the sql that this function generated looks like this:

WHERE  evidence.operation_id = ?
       AND evidence.id IN (SELECT evidence_id
                           FROM   evidence_metadata
                           WHERE  body LIKE ?
                                  AND body LIKE ?)

which includes three parameter placeholders. However, sqlx was complaining because the last two params were passed along as a slice (ie [4, ["%13%", "%seed_juice%"]]) so it counted only two values, which didn't line up with three placeholders. Destructuring the body Like params solves the problem [4, "%13%", "%seed_juice%"] because now there are an equal number of params and placeholders.

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