[PostGIS] #5852: Remove topogeo_addlinestring_expected from the .gitignore

[PostGIS]

#5852: Remove topogeo_addlinestring_expected from the .gitignore
-------------------------+---------------------------
 Reporter:  evsi         |      Owner:  strk
     Type:  enhancement  |     Status:  new
 Priority:  low          |  Milestone:  PostGIS 3.5.3
Component:  topology     |    Version:  3.4.x
 Keywords:               |
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 topogeo_addlinestring_expected has been in the .gitignore for over a
 decade
 https://git.osgeo.org/gitea/postgis/postgis/commit/c6f35551d6b7b58d3d1502ec8ad6dacb9a241680
 However this file is not generated and is needed for tests.

 If somebody pulls the PostGIS repo, then re-adds everything to commit it
 somewhere else, this file will be lost and the subsequent
 topogeo_addlinestring test will fail as the file is missing.

 Dropping it from the .gitignore prevents that.

 I sent the simple change to the osgeo git repo:
 https://git.osgeo.org/gitea/postgis/postgis/pulls/239
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5852>
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