better mdi-logout picto alignment

web/themes/custom/materiotheme/assets/styles/main.scss

@@ -229,7 +229,7 @@ header[role="banner"]{
       }
     }
     .mdi-logout::before {
-      margin: -0.125em 0 0 0;
+      margin: -0.25em 0 0 0;
       vertical-align: top;
     }
   }