fix: change devtools env condition

[dngwoodo]

We basically use process.env.NODE_ENV as 'localhost', so devtools does not work.

So I changed the devtools conditional statement. Please check it out.

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[TkDodo]

this will also add devtools to testing environments where people might not expect it. or, if someone is building their production app with a special NODE_ENV, the devtools will not be split.

if you don't use DEVELOPMENT as NODE_ENV, you can also import the Devtools directly:

import { ReactQueryDevtools } from 'react-query/devtools/development'