Fix compilation warnings of SCT_ConditionsTools
http://atlas-nightlies-browser.cern.ch/~platinum/nightlies/info?tp=c&nightly=master_Athena_x86_64-centos7-gcc8-opt&rel=2019-09-10T2128&ar=x86_64-centos7-gcc8-opt&proj=Athena
http://atlas-computing.web.cern.ch/atlas-computing/links/distDirectory/gitwww/MASTERWebArea/nicos_web_areamaster_Athena_x86_64centos7gcc8opt64BC7G8AthenaOpt/NICOS_Log_2019-09-10T2128/InnerDetector_InDetConditions_SCT_ConditionsTools.html
This was caused by !25800 (merged)