css fix: tag panel should overlay FileItems

src/scss/_dashboard.scss

@@ -299,14 +299,15 @@
   // padding: 15px;
   padding-top: 40px;
   overflow: hidden;
+  z-index: $zIndex-4;
 
   .UppyDashboard--wide & {
     padding-top: 50px;
   }
 
-  .UppyDashboard--modal & {
-    z-index: $zIndex-3;
-  }
+  // .UppyDashboard--modal & {
+  //   z-index: $zIndex-4;
+  // }
 }
 
 .UppyDashboardContent-panel[aria-hidden=false] {