By Michel Rose, Elizabeth Pineau and Ingrid Melander PARIS (Reuters) -French President Emmanuel Macron and far-right challenger Marine Le Pen will face off on Wednesday evening in their only debate ahead of Sunday’s presidential election. For Le Pen, who lags Macron in voter surveys, the much awaited confrontation is a chance to persuade voters she has the stature to be president and they should not fear seeing the far-right in power. For Macron, possibly the biggest challenge to keeping his growing lead in opinion polls will be to not sound arrogant – something many voters have criticised him…