Fix two warnings

esp32_loraprs.ino

@@ -1,4 +1,4 @@
-#include <timer.h>
+#include <arduino-timer.h>
 #include "WiFi.h"
 #include "loraprs_service.h"
 

loraprs_service.cpp

@@ -137,8 +137,6 @@ void Service::setupBt(const String &btName)
 
 void Service::loop()
 { 
-  long r = random(0, 255);
-  
   if (needsWifi() && WiFi.status() != WL_CONNECTED) {
     reconnectWifi();
   }