[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]

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[MortonPL]

Looks good. I've run it and it looks like it also fixes a campaign bug with multiple player houses and uncontrollable stealth units.

From modified all01md.map:

Remember to add an entry in docs/Whats-New.md, CREDITS.md and docs/Fixed-or-Improved-Logics.md (bugfixes section). Once that's done, this PR can be merged.

[chaserli]

Partially already implemented, partially in another PR

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

[Metadorius]

So uhh what are we doing with this one?