[FIX] Disable "Light Exposure" Alert when inside locker for Shadowpeople

[leoworm]

What Does This PR Do

When a Shadowperson enters into a locker, it is treated as if they were in darkness. They are healed, and the "Light Exposure" alert is removed.

Fixes #26833

Why It's Good For The Game

Shadowpeople already have it hard enough. Stops them from being confused due to an inaccuate alert.

Testing

• Turned myself into a shadowperson, burnt myself, then hid in locker to verify that the alert vanishes and I heal

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Declaration

• I confirm that I either do not require pre-approval for this PR, or I have obtained such approval and have included a screenshot to demonstrate this below.

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Changelog

• Added case for when in a locker

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