Update PFA reclustering parameters & correct PFO energy with mass hypothesis

Update PFA reclustering parameters & correct PFO energy with mass hypothesis

Parameters optimized by Yang:

• Neutral cluster merge angle: 0.20 -> 0.18
• Virtual cluster merge angle: 0.24 -> 0.20.
• BMR: 3.82%->3.78%

PFO energy: PFO 4-momentum is not kept consistent internally in EDM4HEP. So re-calculated PFO energy with pion mass hypothesis. This update has minor impact on BMR.