Fix inverted DB pooling value

[smoogipoo]

The condition is currently equivalent to if (str == "False" && str != "0"), i.e.:

• default => false
• "true" (let's assume regardless of capitalisation, though that's not the case in practice) => false
• "1" => false
• "0" => false
• "false" => true

Let's... not do this whole other parsing thingamajig. We haven't needed it until now.