Fix path to Twitter logo

Author: heathermiller

_data/scala-supporters.yml

@@ -18,7 +18,7 @@ supporters:
     logo: /resources/img/frontpage/sap-logo.png
     url: http://www.sap.com
   - name: Twitter
-    logo: /resources/img/twitter-logo.png
+    logo: /resources/img/frontpage/twitter-logo.png
     url: http://www.twitter.com
   - name: Your company
     logo: /resources/img/frontpage/company-logo.png