fix github ribbon

Author: Hosoda Kenji

views/web2py_plugins.html

@@ -1,6 +1,6 @@
 {{extend 'layout.html'}}
-<a class="github-ribbon" href="https://github.com/sqlabs/sqlabs"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://a248.e.akamai.net/assets.github.com/img/71eeaab9d563c2b3c590319b398dd35683265e85/687474703a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677261795f3664366436642e706e67" alt="Fork me on GitHub"></a>
-  
+<a target="_blank" href="https://github.com/scubism/sqlabs"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a>
+ 
 <p class="backto"><a href="{{=URL('web2py_plugins', 'index')}}#{{=response.web2py_plugins.plugin_name}}">
   ← {{=T('Back to the web2py-plugin list')}}
 </a></p>