Fix PlayerStageStats::SetLifeRecordAt to broadcast correct message

Tested with this on ScreenGameplay decorations:
	Def.BitmapText{
		Font= "Common Normal",
		InitCommand= cmd(xy, _screen.cx*.5, 60),
		LifeMeterChangedP1MessageCommand= function(self, param)
			self:settext(("%.3f"):format(param.Life))
		end
	},
	Def.BitmapText{
		Font= "Common Normal",
		InitCommand= cmd(xy, _screen.cx*1.5, 60),
		LifeMeterChangedP2MessageCommand= function(self, param)
			self:settext(("%.3f"):format(param.Life))
		end
	},