fix: Reading buildpack settings and setting them to the right variable

[pacostas]

Summary

This is a fix on integration tests.
Specifically, here

node-run-script/integration/init_test.go

Line 67 in 8da7985

_, err = toml.NewDecoder(file).Decode(&settings.Buildpack)

we want to store the buildpack.toml on settings but instead we store it on settings.buildpack and as a result the settings.buildpack.Name is an empty string on integration tests. Integration tests pass because we use regular expression whenever we reference to it

node-run-script/integration/project_path_test.go

Line 66 in 8da7985

MatchRegexp(fmt.Sprintf(`%s \d+\.\d+\.\d+`, settings.Buildpack.Name)),

Use Cases

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[mhdawson]

LGTM