Added timer start/stop during algo switch

src/workers/Workers.cpp

@@ -210,6 +210,8 @@ void Workers::start(xmrig::Controller *controller)
 
 void Workers::soft_stop() // stop current workers leaving uv stuff intact (used in switch_algo)
 {
+    uv_timer_stop(&m_timer);
+
     if (m_hashrate) {
         m_hashrate->stop();
         delete m_hashrate;
@@ -271,6 +273,8 @@ void Workers::switch_algo(const xmrig::Algorithm& algorithm)
         m_workers.push_back(handle);
         handle->start(Workers::onReady);
     }
+
+    uv_timer_start(&m_timer, Workers::onTick, 500, 500);
 }