Changed settings icon color variable

app/assets/stylesheets/framework/variables.scss

@@ -71,7 +71,6 @@ $gl-avatar-size: 40px;
 $error-exclamation-point: #e62958;
 $border-radius-default: 2px;
 $btn-transparent-color: #8f8f8f;
-$settings-icon-color: #8f8f8f;
 $settings-icon-size: 18px;
 $provider-btn-group-border: #e5e5e5;
 $provider-btn-not-active-color: #4688f1;

app/assets/stylesheets/pages/settings.scss

 .settings-list-icon {
-  color: $settings-icon-color;
+  color: $gl-placeholder-color;
   font-size: $settings-icon-size;
   line-height: 42px;
 }