Trd unpacker: Fix for incorrect time

=> The relative microslice time is now added to the timestamp with the correct units

reco/detectors/trd/unpack/CbmTrdUnpackAlgoR.cxx

@@ -333,7 +333,7 @@ void CbmTrdUnpackAlgoR::makeDigi(Spadic::FexWord<0x10> fw, std::uint32_t criid)
 
     // Store the full time information to last full-time member for error message handling
     // Get the time information and apply the necessary correction
-    ULong64_t time = (fw.timestamp - fw.prec_time) * fSpadic->GetClockCycle() + fMsStartTimeRelCC;
+    ULong64_t time = (fw.timestamp - fw.prec_time) * fSpadic->GetClockCycle() + fMsStartTimeRel;
 
     auto energy = fSpadic->MaxAdcToEnergyCal(fw.maxAdc);
 
@@ -381,7 +381,8 @@ bool CbmTrdUnpackAlgoR::unpack(const fles::Timeslice* ts, std::uint16_t icomp, U
 
   // Get the µSlice starttime relative to the timeslice starttime.
   // The UTC is already to large for storing it CbmTrdRawMessageSpadic due to a cast, caused by the multiplication with a double used in the raw message
-  fMsStartTimeRelCC = (msdesc.idx - fTsStartTime) / fSpadic->GetClockCycle();
+  fMsStartTimeRel   = msdesc.idx - fTsStartTime;
+  fMsStartTimeRelCC = fMsStartTimeRel / fSpadic->GetClockCycle();
 
   // Get the hardware ids from which the current µSlice is coming
   std::uint8_t crobId = 0;

reco/detectors/trd/unpack/CbmTrdUnpackAlgoR.h

@@ -200,6 +200,9 @@ class CbmTrdUnpackAlgoR : public CbmTrdUnpackAlgoBaseR {
   /** @brief Number of corrupted EOM frames */
   size_t fNrCorruptEom = 0;
 
+  /** @brief Start time of the current µSlice relative to the Timeslice start time in ns. */
+  size_t fMsStartTimeRel = 0;
+
   /** @brief Start time of the current µSlice relative to the Timeslice start time in Spadic CC. */
   size_t fMsStartTimeRelCC = 0;