[PostGIS] #5525: Revert change of reliance on pg_file_settings for postgis_topology and postgis_tiger_geocoder

[PostGIS]

#5525: Revert change of reliance on pg_file_settings for postgis_topology and
postgis_tiger_geocoder
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  Reporter:  robe                   |      Owner:  strk
      Type:  defect                 |     Status:  assigned
  Priority:  medium                 |  Milestone:  PostGIS 3.3.5
 Component:  build/upgrade/install  |    Version:  3.3.x
Resolution:                         |   Keywords:  pgextwlist
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Comment (by strk):

 Now the de-duplication is in place, as far as into 3.3 branch - we can fix
 first and then see how to move forward.

 The referenced breaking change moved from using pg_settings to use
 pg_file_settings, what was the rationale for that ?


 Was the querying of pg_settings safe under pgextwlist ?
 Should we postpone the fix to after our CI can run under pgextwlist ? See
 #5566
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5525#comment:14>
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