fix(bazel): use correct `LinkerPackageMappingInfo` field name
fix(bazel): use correct `LinkerPackageMappingInfo` field name

Use the correct field name (`node_modules_roots` instead of
`node_module_roots`) when trying to access data off of the
[LinkerPackageMappingInfo][1] value of a dependency in
`extract_js_module_output()`.

See [here][2] for an example of a failure with the current incorrect
field name.

[1]: https://github.com/bazelbuild/rules_nodejs/blob/2a78e6d815ee36e99cf9cc6462419e16f11c057d/internal/linker/link_node_modules.bzl#L34
[2]: https://circleci.com/gh/angular/angular/1137996

angular/dev-infra,angular/dev-infra,angular/dev-infra,angular/dev-infra