Let Atlas provide a default AI seed.

This addresses the Simulation2 warning about a gamesetup mechanism not
having decided explicitly about the RNG.

Differential Revision: https://code.wildfiregames.com/D1187
Reviewed By: mimo
Refs #4917, 7e05d7edc9 / D1178

This was SVN commit r20726.

source/tools/atlas/AtlasUI/ScenarioEditor/Sections/Map/Map.cpp

@@ -271,6 +271,9 @@ AtObj MapSettingsControl::UpdateSettingsObject()
 	// teams locked
 	m_MapSettings.setBool("LockTeams", wxDynamicCast(FindWindow(ID_MapTeams), wxCheckBox)->GetValue());
 
+	// default AI RNG seed
+	m_MapSettings.setInt("AISeed", 0);
+
 	return m_MapSettings;
 }