Fix a potential anomaly when some selected units are dead or not in player's control in CycleSelectionCommand

[FrozenFog]

What kind of change is this?

• New feature, vanilla bugfix or enhancement of a released feature - changelog, docs and credits entries are needed.
• Improvement to a new (unreleased) feature - docs and credits entries are needed; no changelog entry (Skip Changelog).
• Bugfix to a new (unreleased) feature - credits entry is needed; no changelog or docs entries (Skip Changelog, Skip Docs).
• Bugfix to an old (released) feature - changelog and credits entries are needed; no docs entry (Skip Docs).
• Completely minor change (e.g. a typo fix) - no entries are needed (Skip Changelog, Skip Docs, Skip Credits).

Since the author is me, please apply Skip Credits label.

Description

Fixes an anomaly in the Cycle Selection and Cycle Type Selection hotkeys when part of the
selection the cycle was started with has become unusable while the cycle is still running - the
objects died, went into limbo, or were taken over by another house (mind control).

Since this change is hard to notice in actual combat, there is no need to mention it in the documentation.

[github-actions]

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