[PostGIS] #6032: postgis_tiger_geocoder upgrade script for PostgreSQL < 16 not stripping extension placeholder

[PostGIS]

#6032: postgis_tiger_geocoder upgrade script for PostgreSQL < 16 not stripping
extension placeholder
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 Reporter:  robe            |      Owner:  robe
     Type:  defect          |     Status:  new
 Priority:  medium          |  Milestone:  PostGIS 3.6.2
Component:  tiger geocoder  |    Version:  3.5.x
 Keywords:                  |
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 I guess I didn't have tests to catch this for PostgreSQL < 16.

 It seems that the @extschema:fuzzystrmatch@ is not being stripped for this
 so the upgrade scripts have broken functions.

 This only effects PostgreSQL < 16 because 16 and above the extension
 install automatically replaces this with the extension schema path.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6032>
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