fix EventQueue template functions definition

Fix template functions passing UserAllocatedEvent<...> as argument.

Author: maciejbocianski

events/EventQueue.h

@@ -167,8 +167,8 @@ class EventQueue : private mbed::NonCopyable<EventQueue> {
      *  @return         true  if event was successfully cancelled
      *                  false if event was not cancelled (invalid queue or executing already begun)
      */
-    template<typename... Args>
-    bool cancel(UserAllocatedEvent<Args...> *event)
+    template<typename F, typename A>
+    bool cancel(UserAllocatedEvent<F, A> *event)
     {
         if (event->_equeue != &_equeue) {
             return false;
@@ -213,8 +213,8 @@ class EventQueue : private mbed::NonCopyable<EventQueue> {
      *                  Undefined if id is invalid.
      *
      */
-    template<typename... Args>
-    int time_left(UserAllocatedEvent<Args...> *event)
+    template<typename F, typename A>
+    int time_left(UserAllocatedEvent<F, A> *event)
     {
         if (event && event->_equeue != &_equeue) {
             return -1;