Fix send raw messages

Summary:
^

The last change removed the overload of `send` in favour of `sendRaw`

Reviewed By: LukeDefeo

Differential Revision: D38946386

fbshipit-source-id: c4491c4afe4d719602c99878dc7185d436179aef

xplat/Flipper/FlipperConnectionImpl.h

@@ -67,7 +67,7 @@ class FlipperConnectionImpl : public FlipperConnection {
           "\"params\":"
        << params << "}}";
     auto message = ss.str();
-    socket_->sendMessage(message);
+    socket_->sendMessageRaw(message);
   }
 
   void error(const std::string& message, const std::string& stacktrace)