Pass params into track

I am really confused about [this](https://github.com/floatdrop/insight/compare#diff-0473f6e73d2987d733c32070332b1004R92) approach to pass params to [`push.js`](https://github.com/floatdrop/insight/compare#diff-539df6289b63785f3c1f4660c1db4107R22)