Fixed bug in vel control method

Author: pariaspe

drone_wrapper/src/drone_wrapper/drone_wrapper_class.py

@@ -437,7 +437,7 @@ def set_cmd_vel(self, vx=0, vy=0, vz=0, az=0, frame="flu"):
         if abs(vz) <= EPSILON:
             self.is_z = True
         else:
-            self.setpoint_raw.velocity.z = vtwist.linear.z
+            self.setpoint_raw.velocity.z = twist.linear.z
             self.is_z = False
 
         if self.is_xy: