Fix W3DView camera division by zero

[seer-by-sentry]

Fixes CLIENT-28A. The issue was that: Unchecked division by m_FXPitch in W3DView during shutdown causes INT_DIVIDE_BY_ZERO when m_FXPitch is zero.

• Added checks for m_FXPitch != 0.0f before division operations in camera position calculations.
• Added a check for m_FXPitch != 0.0f before dividing farZ by m_FXPitch.
• Prevents potential division by zero errors and ensures stable camera behavior.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8434525

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