Revert "buildNodePackage: enable strictDeps"
This reverts commit e0705250d2b9b192aa0ee430d61e4039c91d1f55, which
broke patching `#!/usr/bin/env node` shebangs.
It also modified a generated file, which would get reverted the next
time node-env.nix is regenerated.
If we want to enable strictDeps for node packages we should update
node2nix instead.