eve: remove dcerpc.interface from schema

Looks like this was due to an error in the dcerpc logging where the
interfaces should have been logged to the "interfaces" array that was
already defined.

Issue: 5814

etc/schema.json

@@ -3533,19 +3533,6 @@
                         "response": {
                             "type": "string"
                         },
-                        "interface": {
-                            "type": "object",
-                            "optional": true,
-                            "properties": {
-                                "uuid": {
-                                    "type": "string"
-                                },
-                                "version": {
-                                    "type": "string"
-                                }
-                            },
-                            "additionalProperties": false
-                        },
                         "interfaces": {
                             "type": "array",
                             "minItems": 1,