Eliminate symbol pipe

libs/common/src/lib/pipes/index.ts

@@ -1,3 +0,0 @@
-import { GfSymbolPipe } from './symbol.pipe';
-
-export { GfSymbolPipe };

libs/common/src/lib/pipes/symbol.pipe.ts

@@ -1,12 +0,0 @@
-import { prettifySymbol } from '@ghostfolio/common/helper';
-
-import { Pipe, PipeTransform } from '@angular/core';
-
-@Pipe({
-  name: 'gfSymbol'
-})
-export class GfSymbolPipe implements PipeTransform {
-  public transform(aSymbol: string) {
-    return prettifySymbol(aSymbol);
-  }
-}