Fix object tools zindex

jet/static/jet/css/_header.scss

@@ -39,6 +39,7 @@
 
 .user-tools {
   position: relative;
+  z-index: 2;
 
   ul {
     position: absolute;

jet/static/jet/css/_object-tools.scss

@@ -7,6 +7,8 @@
   text-align: right;
   padding: 0;
   margin: 0 0 20px 0;
+  position: relative;
+  z-index: 1;
 
   @include for-mobile {
     text-align: left;