[12gevmoller_sim] [EXTERNAL] [JeffersonLab/remoll] b70f19: add 2mm window at the end of drift pipe

[cipriangal]

  Branch: refs/heads/test_airWindow
  Home:   https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_remoll&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-0uahHXTLsQsllHBZNHgOynLaY6DUxqehsUJ91-BlNY&m=0BRu6GFTRpurVlGtQllV-PHwA3akSfracNFZmGYo8eg&s=_6RjZ9s5Ry0cWAr_iqp87S2kbVr8R1tScRfa6jGRtbc&e= 
  Commit: b70f19c7dd39905f021cdbfde6dd3ef12caedd9a
      https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_JeffersonLab_remoll_commit_b70f19c7dd39905f021cdbfde6dd3ef12caedd9a&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=-0uahHXTLsQsllHBZNHgOynLaY6DUxqehsUJ91-BlNY&m=0BRu6GFTRpurVlGtQllV-PHwA3akSfracNFZmGYo8eg&s=CVmLGVNpRrPEMxOQUyMySV4UThTr4zcoZM-Rlk5EVOg&e= 
  Author: Ciprian Gal <ciprian at jlab.org>
  Date:   2021-06-21 (Mon, 21 Jun 2021)

  Changed paths:
    M geometry/beampipe/downstream/beampipeDSMother.gdml

  Log Message:
  -----------
  add 2mm window at the end of drift pipe