#6372: Improve search filter dropdown styles

netbox/project-static/styles/netbox.scss

@@ -587,11 +587,14 @@ div.content-container {
   white-space: nowrap !important;
 }
 
-#object-type-selector {
-  button.dropdown-item,
-  h6.dropdown-header {
+.search-obj-selector {
+  .dropdown-item,
+  .dropdown-header {
     font-size: $font-size-sm;
   }
+  .dropdown-header {
+    text-transform: uppercase;
+  }
 }
 
 span.color-label {

netbox/project-static/styles/theme-dark.scss

@@ -137,7 +137,7 @@ $dropdown-link-color: $gray-100;
 $dropdown-link-hover-color: $white;
 $dropdown-link-hover-bg: $gray-600;
 $dropdown-link-disabled-color: $gray-800;
-$dropdown-header-color: $gray-300;
+$dropdown-header-color: $gray-600;
 
 // Pagination
 $pagination-color: $link-color;