Fix oauth creds for prospectus sandboxes
Fix oauth creds for prospectus sandboxes

stvstnfrd/configuration,EDUlib/configuration,stvstnfrd/configuration,edx/configuration,arbrandes/edx-configuration,mitodl/configuration,EDUlib/configuration,arbrandes/edx-configuration,EDUlib/configuration,edx/configuration,edx/configuration,edx/configuration,mitodl/configuration,arbrandes/edx-configuration,arbrandes/edx-configuration,EDUlib/configuration,stvstnfrd/configuration,stvstnfrd/configuration,mitodl/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,mitodl/configuration,EDUlib/configuration