[BugFix] Select allied country units that have been cloaked

[Fly-Star-him]

Phobos allow the player to observe friendly units that have been cloaked, but they cannot be selected unless a unit with Sensors=yes is present nearby.

So I made a short fix to select units with Sensors=yes even if they don't exist nearby.

[github-actions[bot]]

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[chaserli]

Partially already implemented, partially in another PR

https://github.com/CnCNet/yrpp-spawner/pull/20 https://github.com/CnCNet/yrpp-spawner/blob/main/src/Misc/Observers.Visibility.cpp

[Metadorius]

So uhh what are we doing with this one?