make starting polar coordinates not const

src/px4_connection/src/px4_controller.cpp

@@ -105,8 +105,8 @@ private:
     const float omega = 0.3; // angular speed of the POLAR trajectory
     const float K = 2;       // [m] gain that regulates the spiral pitch
 
-    const float rho_0 = 0;
-    const float theta_0 = 0;
+    float rho_0 = 0;
+    float theta_0 = 0;
     const float p0_z = -0.0;
     float p0_x = rho_0 * cos(theta_0);
     float p0_y = rho_0 * sin(theta_0);