Fix API typos on SentryPolicyServiceClient

SENTRY-2162 and SENTRY-2224 introduced two new API with typos:

Map<TSentryAuthorizable, TSentryPrivilegeMap> listPrivilegsbyAuthorizable;
SentryObjectPrivileges getAllPrivilegsbyAuthorizable;

Notice the 'Privilegs' word on both. These API are not released yet, so we need to fix it before Sentry 2.1 is released to avoid breaking compatibility.