- Update css to actually support custom sizing

- Remove custom callback in favor of future better solution

admin_interface/static/admin/css/base.css

@@ -420,7 +420,6 @@ select {
 select[multiple] {
     /* Allow HTML size attribute to override the height in the rule above. */
     height: auto;
-    min-height: 150px;
 }
 
 /* FORM BUTTONS */

admin_interface/static/admin_interface/508/dropdown-filter.js

@@ -21,16 +21,7 @@ if (typeof (django) !== 'undefined' && typeof (django.jQuery) !== 'undefined') {
       const applyFiltersButton = document.querySelector('#submit-filters');
       if (applyFiltersButton) {
         applyFiltersButton.onclick = function () {
-          // The code below allows the 508 filter button handler to call functions with the name 
-          // `custom_filter_callback` to handle the query string logic for filters defined outside of this repo and the
-          // native Django Admin Console filters.
-          var custom_filter_query = ""
-          if (typeof custom_filter_callback === "function") {
-            custom_filter_query = custom_filter_callback($)
-          }
-          ////////////////
-
-          window.location = query + custom_filter_query
+          window.location = query
         };
       }
     });