Removing outdated error message about HISubtractedCellMakerTool not being migrated to MT

Closes ATLASRECTS-6076

This merge request affects 1 package:

• Reconstruction/HeavyIonRec/HIJetRec

This merge request affects 1 file:

• Reconstruction/HeavyIonRec/HIJetRec/src/HISubtractedCellMakerTool.cxx

Adding @goetz as watcher

added JetEtmiss Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash 8456989b)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 29766]

Code changes look fine, approving. Pienpen(L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 8db53700

added sweep:ignore label