Make the 1x2x6 EVD service use the refactored geometry

[absolution1]

As reported by @linyan-w on slack, the 1x2x6 evd points to the non-refactored geometry.

This PR:

• Makes the 1x2x6 EVD service use the refactored 1x2x6 geometry

• Removes a spurious 1x2x6 service block that was overriding my fix

  Here is a fcl dump diff before/after the fix:

  [dunegpvm06.fnal.gov@evdGeom]$ diff lar.txt larFix.txt
  178,180c178,180
  <       GDML: "dune10kt_v4_1x2x6.gdml"
  <       Name: "dune10kt_v4_1x2x6"
  <       ROOT: "dune10kt_v4_1x2x6.gdml"
  ---
  >       GDML: "dune10kt_v6_refactored_1x2x6.gdml"
  >       Name: "dune10kt_v6_1x2x6"
  >       ROOT: "dune10kt_v6_refactored_1x2x6.gdml"
  875c875
  <          fileName: "lar.txt"
  ---
  >          fileName: "larFix.txt"