Revert "Fix issue with hot spots displaying over other UI elements."

This reverts commit ab423f66ea.

src/css/pannellum.css

@@ -30,7 +30,7 @@
     position: absolute;
     width: 100%;
     height: 100%;
-    z-index: 2;
+    z-index: 1;
 }
 
 .pnlm-grab {