prevent warnings during assets build process, re #2801

resources/assets/stylesheets/scss/index.scss

@@ -195,7 +195,7 @@ $gap-between-boxes: calc($login-page-margin / 2);
             width: 48px;
             height: 48px;
             border: none;
-            @include background-icon('bullet-dot', clickable, 24);
+            @include background-icon('bullet-dot', $size: 24px);
             background-repeat: no-repeat;
             background-color: transparent;
             background-position: center;
@@ -406,7 +406,7 @@ $gap-between-boxes: calc($login-page-margin / 2);
 }
 
 /* * * * * * * * * *
-responsive settings 
+responsive settings
 * * * * * * * * * */
 html:not(.size-large) {
     #login-wrapper {