Fix confused VP A and C side assignment

Kernel/LHCbKernel/include/Kernel/HitPattern.h

@@ -178,7 +178,7 @@ namespace LHCb {
     case LHCbID::channelIDtype::VP: {
       const auto vpid    = id.vpID();
       const auto station = vpid.station();
-      if ( vpid.sidepos() == 0 ) {
+      if ( vpid.sidepos() == LHCb::Detector::VPChannelID::Side::A ) {
         advance( m_veloA[station] );
       } else {
         advance( m_veloC[station] );