ESlint: fix imports

src/app/bitstream-page/bitstream-authorizations/bitstream-authorizations.component.ts

@@ -1,8 +1,13 @@
-import { Component, OnInit } from '@angular/core';
+import {
+  Component,
+  OnInit,
+} from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
-
 import { Observable } from 'rxjs';
-import { first, map } from 'rxjs/operators';
+import {
+  first,
+  map,
+} from 'rxjs/operators';
 
 import { RemoteData } from '../../core/data/remote-data';
 import { DSpaceObject } from '../../core/shared/dspace-object.model';