STDM11: Added missing HLT_j45

Tigran Mkrtchyanrequested to merge
tmkrtchy/athena:21.2-STDM11updateLowMu into 21.2

Recently noticed that HLT_j45 was missing, which is now being added.

Tagging @eyatsenk and @bili

Edited by Tigran Mkrtchyan

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