Fix: Industry coverage area is no longer rectangular. (#7464)

AIs test station catchment in reverse to how players see station catchment.
This did not take account of non-rectangular station catchment areas, so AIs
could end up placing stations in locations that did not accept/deliver cargo.

bin/ai/regression/tst_regression/result.txt

@@ -8534,7 +8534,7 @@ ERROR: IsEnd() is invalid as Begin() is never called
     19693 => 8
 
 --TileList_IndustryProducing--
-  Count():             92
+  Count():             90
   Location ListDump:
     46919 => 1
     46918 => 1
@@ -8626,8 +8626,6 @@ ERROR: IsEnd() is invalid as Begin() is never called
     44353 => 1
     44352 => 1
     44351 => 1
-    46920 => 0
-    46911 => 0
 
 --TileList_StationType--
   Count():             4