FIX: Only write DeadtimeFileName to DEE XML config once

[fhagemann]

In the DEE, both MSubModuleStripTrigger and MSubModuleShieldTrigger use the same deadtime parameters file (m_DeadtimeFileName).

The way that ReadXmlConfiguration and CreateXmlConfiguration are implemented right now, we add the tag DeadtimeFileName TWICE to the XmlTagDEESMEX:

<XmlTagDEESMEX>
  <ShieldEnergyCorrectionFileName />
  <DeadtimeFileName />                                   <----- here
  <EnergyCalibrationFileName />
  <DeadtimeFileName>SomeFile.txt</DeadtimeFileName>      <----- and here
  <TACCalFileName />
  <DepthSplineFileName />
  <DepthCoefficientsFileName />
  <ApplyResolutionCalibration>true</ApplyResolutionCalibration>
  <EnableShieldVeto>true</EnableShieldVeto>
  <EnableGuardRingVeto>true</EnableGuardRingVeto>
  <ApplyTimingResolutionCalibration>true</ApplyTimingResolutionCalibration>
</XmlTagDEESMEX>

In this PR, I store the file name in the mother module MModuleDEESMEX and distribute it to the MSubModules, just as it is done for the depth coefficients files that are also used by several MSubModules.

[ckierans]

Perfect! Thanks for the quick fix, @fhagemann !

[zoglauer]

Looks good!