SciFi Hit Residuals need correcting to match Data and MC in FTHitMeasurementProvider

https://gitlab.cern.ch/lhcb/Rec/-/blob/master/Tr/TrackTools/src/FTMeasurementProvider.cpp#L82 produces too small errors

0.04 + 0.01 * itH->pseudoSize(), // FIXME need a better error parametrization

better values would look like

//better represerntation with merged clusters
         double(( itH->pseudoSize()== 0) ? 0.255 : (0.1025 *  itH->pseudoSize() - 0.2424)), 

         //when using split clusters
				 //				 double(( itH->pseudoSize()== 0) ? 0.21 : (0.0275 *  itH->pseudoSize()+ 0.0037)),