[editor] Fix Table icon

The icon 'table' does look different for some reason. Taking the second 
best available icon.

projects/common/models/elements/compound-elements/table/table.ts

@@ -12,7 +12,6 @@ import { InstantiationEror } from 'common/util/errors';
 import { environment } from 'common/environment';
 import { TableComponent } from 'common/components/compound-elements/table/table.component';
 import { ElementFactory } from 'common/util/element.factory';
-import { ClozeDocument } from 'common/models/elements/compound-elements/cloze/cloze';
 
 export class TableElement extends CompoundElement implements PositionedUIElement, TableProperties {
   type: UIElementType = 'table';
@@ -24,7 +23,7 @@ export class TableElement extends CompoundElement implements PositionedUIElement
   styling: BasicStyles & BorderStyles;
 
   static title: string = 'Tabelle';
-  static icon: string = 'table';
+  static icon: string = 'table_view';
 
   constructor(element?: TableProperties) {
     super(element);

projects/editor/src/app/app.component.ts

@@ -4,8 +4,6 @@ import { registerLocaleData } from '@angular/common';
 import localeDe from '@angular/common/locales/de';
 import { VeronaAPIService, StartCommand } from './services/verona-api.service';
 import { UnitService } from './services/unit-services/unit.service';
-import { MatIconRegistry } from '@angular/material/icon';
-import { DomSanitizer } from '@angular/platform-browser';
 
 @Component({
   selector: 'aspect-editor',