Fixed pytest settings
Fixed pytest settings

The pytest settings were using an invalid module path of `sga-lti` instead of `sga_lti`. That has been updated and tests are now executing properly.

koljanos/sga-lti,mitodl/sga-lti,koljanos/sga-lti,mitodl/sga-lti,mitodl/sga-lti,koljanos/sga-lti,koljanos/sga-lti,mitodl/sga-lti