Fixes missing sprite for mutated watcher facehugger. (#5446)

# About the pull request
This PR just adds the normal sprite rather than making a custom one, as
an intermediate fix for otherwise invisbile facehuggers.
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# Explain why it's good for the game
Invisible huggers are bad.
# Testing Photographs and Procedure
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<summary>Screenshots & Videos</summary>

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# Changelog
:cl:
fix: Mutated facehuggers are no longer invisible.
/:cl: