Fix API sync test
Fix API sync test

When one fetch API command produces two files and only the first one is out of
sync, the exit code of the script was still 0. This is a fix for that.


Former-commit-id: 3dd18d780d03d98eebdfc773df0a90c0641df881
cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend