Add --no-vd-destroy-content

Add an option to disable the following flag for virtual displays:

    DisplayManager.VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL

With this option, when the virtual display is closed, the running apps
are moved to the main display rather than being destroyed.

PR #5615 <https://github.com/Genymobile/scrcpy/pull/5615>