FlightTaskManual: remove unnecessary activate method

src/lib/FlightTasks/tasks/FlightTaskManual.cpp

@@ -61,13 +61,6 @@ bool FlightTaskManual::initializeSubscriptions(SubscriptionArray &subscription_a
 	return true;
 }
 
-bool FlightTaskManual::activate()
-{
-	bool ret = FlightTask::activate();
-
-	return ret;
-}
-
 bool FlightTaskManual::updateInitialize()
 {
 	bool ret = FlightTask::updateInitialize();

src/lib/FlightTasks/tasks/FlightTaskManual.hpp

@@ -52,8 +52,6 @@ public:
 
 	bool initializeSubscriptions(SubscriptionArray &subscription_array) override;
 
-	bool activate() override;
-
 	bool applyCommandParameters(const vehicle_command_s &command) override { return FlightTask::applyCommandParameters(command); };
 
 	bool updateInitialize() override;