Fix a bug that could make the vehicle deliver the package in the wrong place

[leomichalski]

Right now, if the vehicle detects an ArUco marker 1 meter off from the vehicle's initial position, it will deliver the package there. The code currently supposes there's only 1 marker in the whole flight area.

Task:

• Check if the ArUco detection is within some meters of the package delivery location before considering it as a place where the vehicle should deliver the package.