Fix scene list table styling issues (#6169)

* Reduce z-index of table list header
* Set better max-height for scene list table

ui/v2.5/src/components/List/styles.scss

@@ -740,7 +740,7 @@ input[type="range"].zoom-slider {
       background-color: #202b33;
       position: sticky;
       top: 0;
-      z-index: 100;
+      z-index: 1;
     }
 
     td:first-child {

ui/v2.5/src/components/Scenes/styles.scss

@@ -958,3 +958,9 @@ input[type="range"].blue-slider {
     }
   }
 }
+
+.table-list.scene-table {
+  // Set max height to viewport height minus estimated header/footer height
+  // TODO - this will need to be rolled out to other tables
+  max-height: calc(100dvh - 210px);
+}