Decouple the calculations of TurretOffset and HeightShadowScaling

[DeathFishAtEase]

When drawing the shadow of an airborne unit, TurretOffset is applied to a transformation matrix that has already been scaled for height, causing the turret shadow's offset to be scaled as well and resulting in a misalignment with the actual turret image position.

Note

Example reproduction steps:

1. Duplicate a [DISK] unit
   • It flies in the air while its shadow is on the ground, making it easy to observe.
2. Set ShadowIndex=-1 on both to hide the body shadow
   • Leaving only the turret shadow visible for clarity.
3. Apply a TurretOffset to one of them to displace the turret by a certain distance
   • Preferably a multiple of cell distance, e.g., 512 leptons as in the image below.
4. Place both units at the same altitude and separate them horizontally by the same amount as the TurretOffset value. Check if the two turret shadows overlap.

Before:

After:

[github-actions]

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