moved keyword interface to correct .ts file; removed unnessesary keyword.ts file

src/app/components/shared/topic-cloud-dialog/keyword.ts

-import { Identifiers } from "@angular/compiler";
-
-export interface Keyword{
-    keywordID: number;
-    keyword: string;
-    questions: string[];
-}
\ No newline at end of file

src/app/components/shared/topic-cloud-dialog/topic-cloud-dialog.component.ts

 import { Component, OnInit } from '@angular/core';
-import {Keyword} from './keyword';
 import { MatDialogRef } from '@angular/material/dialog';
 import { HeaderComponent } from '../header/header.component';
 import { NotificationService } from '../../../services/util/notification.service';
@@ -79,3 +78,9 @@ export class TopicCloudDialogComponent implements OnInit {
     console.log("are u sure?");
   }
 }
+
+export interface Keyword {
+  keywordID: number;
+  keyword: string;
+  questions: string[];
+}