Don't need a default value if we only have one enum

docs/api/DLUHC-CORE-Data.v1.json

@@ -56,8 +56,7 @@
               "type": "string",
               "enum": [
                 "application/json"
-              ],
-              "default": "application/json"
+              ]
             },
             "in": "header",
             "name": "Accept",
@@ -135,7 +134,6 @@
           {
             "schema": {
               "type": "string",
-              "default": "application/json",
               "enum": [
                 "application/json"
               ]
@@ -177,7 +175,6 @@
           {
             "schema": {
               "type": "string",
-              "default": "application/json",
               "enum": [
                 "application/json"
               ]
@@ -243,7 +240,6 @@
             "schema": {
               "type": "string",
               "pattern": "application/json",
-              "default": "application/json",
               "enum": [
                 "application/json"
               ]