RichDAQ - Decoding fixes when inactive links are present

Addresses some issues in the decoding when there are inactive Tel40 links.

Kernel/LHCbKernel/include/Kernel/RichSmartID.h

@@ -1160,6 +1160,26 @@ namespace LHCb {
       }
     }
 
+    /// Returns a 'local' EC pixel row number for each PMT corrected for the PMT rotations in the EC
+    [[nodiscard]] constexpr std::int32_t ecGlobalPMTFrameX2() const
+#ifdef NDEBUG
+        noexcept
+#endif
+    {
+      assert( isPMT() );
+      static_assert( MaPMT::PDGlobalViewShift % 2 == 0 );
+      if ( isPMT() ) {
+        const auto iCol    = panelLocalModuleColumn();
+        const auto iLocalX = -ecLocalPMTFrameX();
+        return ( isHTypePMT() ? ( iCol * MaPMT::PDGlobalViewShift ) + ( 2 * iLocalX ) + 1
+                              : ( iCol * MaPMT::PDGlobalViewShift ) -
+                                    ( ( pdNumInEC() % 2 ) * ( MaPMT::PDGlobalViewShift / 2 ) ) + iLocalX );
+      } else {
+        // HPD fallback
+        return 0;
+      }
+    }
+
   public:
     // messaging