fix: use square brackets with os.environ

Author: ofr1tz

mapswipe_workers/mapswipe_workers/definitions.py

@@ -17,7 +17,7 @@
 OSMCHA_API_LINK = "https://osmcha.org/api/v1/"
 OSMCHA_API_KEY = os.environ["OSMCHA_API_KEY"]
 MAPILLARY_API_LINK = "https://tiles.mapillary.com/maps/vtp/mly1_computed_public/2/"
-MAPILLARY_API_KEY = os.environ("MAPILLARY_API_KEY")
+MAPILLARY_API_KEY = os.environ["MAPILLARY_API_KEY"]
 
 # number of geometries for project geometries
 MAX_INPUT_GEOMETRIES = 10