Fix potential null dereference in W3DModelDraw

[seer-by-sentry]

Fixes CLIENT-33C. The issue was that: W3DModelDraw::adjustTransformMtx dereferences m_curState without null-checking, causing an access violation when m_curState is nullptr.

• Added a null check for 'm_curState' before accessing its 'm_flags' member.
• Prevents potential crashes if 'm_curState' is null when checking the 'ADJUST_HEIGHT_BY_CONSTRUCTION_PERCENT' flag.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 9308547

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