Copter: remove redundant takeoff_stop from flowhold

ArduCopter/mode_althold.cpp

@@ -18,9 +18,6 @@ bool Copter::ModeAltHold::init(bool ignore_checks)
         pos_control->set_desired_velocity_z(inertial_nav.get_velocity_z());
     }
 
-    // stop takeoff if running
-    takeoff_stop();
-
     return true;
 }
 

ArduCopter/mode_flowhold.cpp

@@ -103,9 +103,6 @@ bool Copter::ModeFlowHold::init(bool ignore_checks)
     quality_filtered = 0;
     flow_pi_xy.reset_I();
     limited = false;
-    
-    // stop takeoff if running
-    copter.takeoff_stop();
 
     flow_pi_xy.set_dt(1.0/copter.scheduler.get_loop_rate_hz());