Clamp gamma value to valid range to prevent crashes/invalid calculations

[seer-by-sentry]

Fixes CLIENT-1KZ. The issue was that: Corrupted user preference value causes Windows system library to execute integer division by zero during runtime class initialization.

• Clamped the gamma value read from Options.ini in OptionsMenu.cpp (Generals and GeneralsMD) between 0.0f and 100.0f to prevent crashes from corrupted configuration files.
• Clamped the integer gamma value used in GlobalData.cpp (Generals and GeneralsMD) between 0 and 100 to prevent division by zero or invalid calculations during gamma adjustment logic.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8140651

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