fix(common): change to relative paths for server check imports

Fix imports to `DOCUMENT` DI token and `isPlatformServer` function to remove circular dependencies

packages/common/src/directives/ng_optimized_image/ng_optimized_image.ts

@@ -6,10 +6,11 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {DOCUMENT, isPlatformServer} from '@angular/common';
 import {Directive, ElementRef, inject, Injector, Input, NgZone, OnChanges, OnDestroy, OnInit, PLATFORM_ID, Renderer2, SimpleChanges, ɵformatRuntimeError as formatRuntimeError, ɵRuntimeError as RuntimeError} from '@angular/core';
 
+import {DOCUMENT} from '../../dom_tokens';
 import {RuntimeErrorCode} from '../../errors';
+import {isPlatformServer} from '../../platform_id';
 
 import {imgDirectiveDetails} from './error_helper';
 import {IMAGE_LOADER} from './image_loaders/image_loader';