[12gevmoller_sim] [JeffersonLab/remoll] dc3356: bring tgt chamber in line with other files

[cipriangal]

  Branch: refs/heads/feature-add-SBSbunker
  Home:   https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FJeffersonLab%2Fremoll&data=02%7C01%7C12gevmoller_sim%40jlab.org%7Cf5258b5884814211788508d6a73572c2%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636880245343577592&sdata=zmVvIYU2D2QAbz7nQBuezAXRm%2BbBtkbKtRvKZxtuzM4%3D&reserved=0
  Commit: dc33562c4e240196de6ba876000f926745b96d55
      https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FJeffersonLab%2Fremoll%2Fcommit%2Fdc33562c4e240196de6ba876000f926745b96d55&data=02%7C01%7C12gevmoller_sim%40jlab.org%7Cf5258b5884814211788508d6a73572c2%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636880245343577592&sdata=We3vefN7JzD1vuxQy%2BgYFSm0%2Fhtt%2FlwaZqNaevVRFu0%3D&reserved=0
  Author: Ciprian Gal <ciprian at jlab.org>
  Date:   2019-03-12 (Tue, 12 Mar 2019)

  Changed paths:
    M geometry/target/subTargetRegion.gdml

  Log Message:
  -----------
  bring tgt chamber in line with other files