remove default database URL as it defined in .env

Author: ismail1432

doctrine/doctrine-bundle/1.6/config/packages/doctrine.yaml

@@ -1,10 +1,3 @@
-parameters:
-    # Adds a fallback DATABASE_URL if the env var is not set.
-    # This allows you to run cache:warmup even if your
-    # environment variables are not available yet.
-    # You should not need to change this value.
-    env(DATABASE_URL): ''
-
 doctrine:
     dbal:
         # configure these for your database server