Fix finding package location for blitz in node_modules

[itsdillon]

Closes: ?

What are the changes and their implications?

Previously postinstall which is ran when @blitzjs/next is installed was finding the wrong node_modules directory. This fix should locate the right blitz cli node script.

[changeset-bot[bot]]

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Latest commit: 653dac8a689e253a8e1806645067aeadeba5f932

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