remove decorator that is not compatible with all CDS datasets

Author: EddyCMWF

src/earthkit/data/sources/cds.py

@@ -145,7 +145,6 @@ def retrieve(target, args):
         return return_object
 
     @staticmethod
-    @normalize("date", "date-list(%Y-%m-%d)")
     @normalize("area", "bounding-box(list)")
     def _normalize_request(**kwargs):
         return kwargs