Fix: Update iframe selector to use 'preview-iframe' class

The 'Open in New Tab' button was not working because it was looking
for an iframe with class 'preview', but the UI revamp changed it to
'preview-iframe'. This updates the JavaScript selector to match.

- Update  to  in open-preview click handler
- Update  to  in refreshPreview function

Fixes the bug where clicking 'Open in New Tab' opened a blank page.

Author: leandrowilliam

src/registry/views/static/info.ts

@@ -25,7 +25,7 @@ oc.cmd.push(function() {
       url += splitted[1];
     }
 
-    $('.preview').attr('src', url);
+    $('.preview-iframe').attr('src', url);
 
     return false;
   };
@@ -95,7 +95,7 @@ oc.cmd.push(function() {
 
   $('.open-preview').click(function() {
     refreshPreview();
-    var url = $('.preview').attr('src');
+    var url = $('.preview-iframe').attr('src');
 
     window.open(url, '_blank');
     return false;