Fix $send escape for TcpClient

Author: ethancheez

Arduino/Drv/TcpClient/TcpClient.fpp

@@ -15,7 +15,7 @@ module Arduino {
         output port deallocate: Fw.BufferSend
 
         @ Takes data to transmit out the UART device
-        guarded input port send: Drv.ByteStreamSend
+        guarded input port $send: Drv.ByteStreamSend
 
         @ Takes data to transmit out the UART device
         output port $recv: Drv.ByteStreamRecv