Merge pull request #15794 from grafana/hugoh/bug-serveradmin-icon-to-dark-in-light-theme

Add gicon-shield to sidemenu class

public/sass/base/_icons.scss

@@ -212,6 +212,9 @@
   .gicon-explore {
     background-image: url('../img/icons_dark_theme/icon_explore.svg');
   }
+  .gicon-shield {
+    background-image: url('../img/icons_dark_theme/icon_shield.svg');
+  }
 }
 
 .fa--permissions-list {