fix(navbar): minor style changes (#757)

Author: arjunlalb

projects/components/src/navigation/navigation-list.component.scss

@@ -25,7 +25,7 @@
       }
 
       .beta {
-        margin-left: 8px;
+        margin-left: 4px;
       }
     }
   }
@@ -84,5 +84,5 @@
 }
 
 .expanded {
-  width: 228px;
+  width: 236px;
 }