[PostGIS] #5678: WARNING: nonstandard use of escape in a string literal

[PostGIS]

#5678: WARNING:  nonstandard use of escape in a string literal
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.5.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by strk):

 The warning is in the populate_topology_layer function, which is also
 broken at the moment, see #5680
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5678#comment:4>
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