correct electron config to not point at personal piwik

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

Author: t3chguy

electron_app/riot.im/config.json

@@ -14,7 +14,7 @@
         ]
     },
     "piwik": {
-        "url": "//piwik.riot.ovh/",
-        "siteId": 2
+        "url": "//piwik.riot.im/",
+        "siteId": 1
     }
 }