Fix the wrong histogram size in CaloTImeAlignment to solve RecoMon memory issue

This should solve the RecoMon memory issue: https://lblogbook.cern.ch/HLT/1863

I ran the testbench with this fix, it doesn't use 15GB anymore.

FYI: @sponce @tmombach @mfontana @decianm @vsvintoz @msaur