Fix typo in the name of attribute for AlumniAccountEnabled
Fix typo in the name of attribute for AlumniAccountEnabled

 - there was typo in the name of used attribute for AlumniAccountEnabled
 attribute

CESNET/perun-services,zlamalp/perun-services,stavamichal/perun-services,sustr4/perun-services,stavamichal/perun-services,CESNET/perun-services,zlamalp/perun-services,CESNET/perun-services,sustr4/perun-services,stavamichal/perun-services,sustr4/perun-services,CESNET/perun-services,zlamalp/perun-services,stavamichal/perun-services,sustr4/perun-services,zlamalp/perun-services