sab: dropdown color fix

CSS/themes/sabnzbd/sabnzbd-base.css

@@ -91,6 +91,9 @@ body {
   color: #ffffff;
   background-color: rgba(255, 255, 255, 0.08);
 }
+.dropdown-header {
+  color: #fff;
+}
 .menu-options .form-control {
   background: var(--modal-bg-color);
   background-color: rgb(25, 26, 28);