fix typo in tileServer attribute

Author: Hagellach37

mapswipe_workers/mapswipe_workers/project_types/tile_map_service_grid/project.py

@@ -20,7 +20,7 @@ def __init__(self, project_draft: dict):
 
         # get TileServerB for change detection and completeness type
         if self.project_type in [3, 4]:
-            self.tileServer = vars(BaseTileServer(project_draft["tileServerB"]))
+            self.tileServerB = vars(BaseTileServer(project_draft["tileServerB"]))
 
     def validate_geometries(self):
         raw_input_file = (