jFEX MET fixing hemisphere sign

Sergi Rodriguez Bosca requested to merge serodrig/athena:METround into 23.0

This MR is meant to solve one rounding problem due to the wrong place when assign the hemisphere sign.

With this MET and SumET algorithms are matching 100% for jFEX simulation.

PS. Applying noise cuts - Pileup subs. not studied yet

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