Added Conectivity tab to Zero Rating plugin

Summary: Cennectivity tab should allow setting Mock Connectivity via Flipper

Reviewed By: zaxy78

Differential Revision: D22816950

fbshipit-source-id: 938d8bcaa50ad4f1abe4e253aeac0cd247252b37

desktop/static/icons.json

@@ -436,5 +436,8 @@
   ],
   "megaphone": [
     12
+  ],
+  "wireless": [
+    16
   ]
 }