AIGroup: Advance iterator before calling doCommandButton

[seer-by-sentry]

Fixes CLIENT-GT. The issue was that: Iterating over AIGroup::m_memberList while executing Object::doCommandButton allows object self-destruction, causing list modification and iterator invalidation, leading to an access violation.

• Fixes a potential crash where the object being iterated over in the AIGroup's member list is destroyed during the doCommandButton call.
• The iterator is now incremented before the call to doCommandButton to prevent issues when the object removes itself from the list.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 1964834

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