Fixes #19030 - Update z-index of floating buttons (#19118)

* Increase z-index of form floating buttons

* Update netbox.css

netbox/project-static/styles/custom/_misc.scss

@@ -38,7 +38,7 @@ span.color-label {
 .btn-float-group {
   position: sticky;
   bottom: 10px;
-  z-index: 2;
+  z-index: 4;
 }
 
 .btn-float-group-left {