Copter: fix do_user_takeoff indentation

No functional change

ArduCopter/takeoff.cpp

@@ -30,10 +30,10 @@ bool Copter::do_user_takeoff(float takeoff_alt_cm, bool must_navigate)
     if (motors.armed() && ap.land_complete && current_mode_has_user_takeoff(must_navigate) && takeoff_alt_cm > current_loc.alt) {
 
 #if FRAME_CONFIG == HELI_FRAME
-    // Helicopters should return false if MAVlink takeoff command is received while the rotor is not spinning
-    if (!motors.rotor_runup_complete()){
-        return false;
-    }
+        // Helicopters should return false if MAVlink takeoff command is received while the rotor is not spinning
+        if (!motors.rotor_runup_complete()) {
+            return false;
+        }
 #endif
 
         switch(control_mode) {