[DevTools] Fixed output of string consisting multiple spaces

Source/devtools/front_end/components/objectValue.css

 /*
  * Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 .object-value-scientific-notation-exponent {
     flex-shrink: 0;
 }
 
@@ skipping 42 matching lines @@
 
 .object-value-number,
 .object-value-boolean {
     color: rgb(28, 0, 207);
 }
 
 .object-value-string,
 .object-value-regexp,
 .object-value-symbol {
     color: rgb(196, 26, 22);
-    white-space: nowrap;
+    white-space: pre;
     unicode-bidi: -webkit-isolate;
 }
 
 .object-value-node {
     color: rgb(136, 18, 128);
 }
 
 .object-value-null,
 .object-value-undefined {
     color: rgb(128, 128, 128);
@@ skipping 34 matching lines @@
 
 .object-value-preview-node,
 .section .object-value-node {
     color: rgb(136, 18, 128);
 }
 
 .object-properties-section-custom-section {
     display: inline-flex;
     flex-direction: column;
 }