add z-index to select2 dropdowns to appear higher than than modal

opentech/static_src/src/sass/apply/components/_select2.scss

 .select2 {
-    .select2-container--default {
+    &-container {
+        z-index: 99995; // to override any modals
+    }
+
+    .select2-container--default,
+    &.select2-container--default {
         width: 100% !important;
 
         .select2-selection--single {