[Dark Theme] Fix for bg color of bread crumb in editor

As we changed the background color of editor to more darker shade,
background of breadcrumbs were still using the older color code. This
has been changed to same color code as editor's.

org.eclipse.jdt.ui/css/e4-dark_jdt_syntaxhighlighting.css

@@ -136,6 +136,6 @@ FormatterPreferenceSectionComposite {
      * the background with the lighter color used for the background
      * of toolbars and make the foreground color brighter too.
      */
-    background-color:#515658;
+    background-color:#1E1F22;
     color: white;
 }