fixed import

src/app/+item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts

-import { Injectable, OnInit } from '@angular/core';
+import { Component, Injectable, OnInit } from '@angular/core';
 import { FieldUpdate, FieldUpdates } from '../../../core/data/object-updates/object-updates.reducer';
 import { Observable } from 'rxjs/internal/Observable';
 import { Item } from '../../../core/shared/item.model';