Remove enabling of girder plugins in ansible
Remove enabling of girder plugins in ansible

In girder 3, plugins are enabled by pip installing them,
and they are disabled by pip uninstalling them.

Because plugins cannot be enabled using other methods,
enabling of girder plugins in ansible was removed as of
[this commit](https://github.com/girder/girder/commit/fdef621b184600d9b3edf1634ccd9f618dea9fcf).

Thus, remove the enabling of girder plugins in ansible
to reflect that.

Signed-off-by: Patrick Avery <743342299f279e7a8c3ff5eb40671fce3e95f13a@kitware.com>

OpenChemistry/mongochemdeploy,OpenChemistry/mongochemdeploy