Remove RES constant from OCW departments (#4339)

Author: ibrahimjaved12

course_catalog/constants.py

@@ -256,7 +256,6 @@ class PrivacyLevel(Enum):
         "slug": "athletics-physical-education-and-recreation",
         "name": "Athletics, Physical Education and Recreation",
     },
-    "RES": {"slug": "supplemental-resources", "name": "Supplemental Resources"},
     "SP": {"slug": "special-programs", "name": "Special Programs"},
     "STS": {
         "slug": "science-technology-and-society",