[services] Blob - Fix test name for storage manager tests

Summary:
Depends on D3594

This name was just wrong

Test Plan:

cd services
yarn test-blob-service

still works

Reviewers: geekbrother, palys-swm, varun, jimpo

Reviewed By: palys-swm

Subscribers: ashoat, palys-swm, Adrian, atul, benschac, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3596