relay: pulse timer is transferable as basic timer

code/espurna/relay.cpp

@@ -453,8 +453,12 @@ struct Timer {
     using Duration = timer::SystemTimer::Duration;
 
     Timer() = delete;
+
     Timer(const Timer&) = delete;
-    Timer(Timer&&) = delete;
+    Timer& operator=(const Timer&) = delete;
+
+    Timer(Timer&&) = default;
+    Timer& operator=(Timer&&) = default;
 
     Timer(Duration duration, size_t id, bool status) :
         _duration(duration),
@@ -466,9 +470,6 @@ struct Timer {
         _timer.stop();
     }
 
-    Timer& operator=(const Timer&) = delete;
-    Timer& operator=(Timer&&) = delete;
-
     explicit operator bool() const {
         return static_cast<bool>(_timer);
     }