For ".imageFeed svg.zones" apply z-index: 100 (skin.css)

On the Zones page, with the default player = go2rtc, a zone may not display due to the added <video-stream> tag
due to "position: relative"
And zones should always be above all other elements.
Possible fix #4648

web/skins/classic/css/base/skin.css

@@ -1044,6 +1044,9 @@ a.flip {
   right: 0;
   background: none;
 }
+.imageFeed svg.zones {
+  z-index: 100;
+}
 .colThumbnail img {
   border-radius: 4px;
 }