Cleanup unused interface

Author: Steve Rhoades

projects/ng-dynamic-forms/core/src/lib/model/misc/dynamic-form-control-data.model.ts

@@ -1,9 +1,6 @@
 import {Observable} from 'rxjs';
 import {DynamicFormOptionConfig} from '../dynamic-option-control.model';
 
-export interface DynamicFormControlDataOptionConfig extends DynamicFormOptionConfig<any> {
-}
-
 export interface DynamicFormControlDataRelation {
   rootPath?: string;
   id?: string;

projects/ng-dynamic-forms/core/src/lib/service/dynamic-form-data.service.spec.ts

@@ -5,7 +5,6 @@ import { DynamicSelectModel } from "../model/select/dynamic-select.model";
 import { DynamicRadioGroupModel } from "../model/radio/dynamic-radio-group.model";
 import {DynamicFormDataService} from './dynamic-form-data.service';
 import {
-  DynamicFormControlDataOptionConfig,
   DynamicFormControlListDataProvider,
   DynamicFormControlOptionDataProvider
 } from '../model/misc/dynamic-form-control-data.model';