Remove mistakenly duplicated anyOf tests in draft{4,6,7}.

These were fully duplicated accidentally (which the uniqueness
check now finds).

Author: Julian

tests/draft4/anyOf.json

@@ -127,32 +127,6 @@
             }
         ]
     },
-    {
-        "description": "nested anyOf, to check validation semantics",
-        "schema": {
-            "anyOf": [
-                {
-                    "anyOf": [
-                        {
-                            "type": "null"
-                        }
-                    ]
-                }
-            ]
-        },
-        "tests": [
-            {
-                "description": "null is valid",
-                "data": null,
-                "valid": true
-            },
-            {
-                "description": "anything non-null is invalid",
-                "data": 123,
-                "valid": false
-            }
-        ]
-    },
     {
         "description": "nested anyOf, to check validation semantics",
         "schema": {

tests/draft6/anyOf.json

@@ -160,32 +160,6 @@
             }
         ]
     },
-    {
-        "description": "nested anyOf, to check validation semantics",
-        "schema": {
-            "anyOf": [
-                {
-                    "anyOf": [
-                        {
-                            "type": "null"
-                        }
-                    ]
-                }
-            ]
-        },
-        "tests": [
-            {
-                "description": "null is valid",
-                "data": null,
-                "valid": true
-            },
-            {
-                "description": "anything non-null is invalid",
-                "data": 123,
-                "valid": false
-            }
-        ]
-    },
     {
         "description": "nested anyOf, to check validation semantics",
         "schema": {

tests/draft7/anyOf.json

@@ -160,32 +160,6 @@
             }
         ]
     },
-    {
-        "description": "nested anyOf, to check validation semantics",
-        "schema": {
-            "anyOf": [
-                {
-                    "anyOf": [
-                        {
-                            "type": "null"
-                        }
-                    ]
-                }
-            ]
-        },
-        "tests": [
-            {
-                "description": "null is valid",
-                "data": null,
-                "valid": true
-            },
-            {
-                "description": "anything non-null is invalid",
-                "data": 123,
-                "valid": false
-            }
-        ]
-    },
     {
         "description": "nested anyOf, to check validation semantics",
         "schema": {