Remove remanents of entityObj

All uses have been removed.

binaries/data/mods/public/simulation/ai/common-api/shared.js

@@ -243,9 +243,8 @@ SharedScript.prototype.ApplyEntitiesDelta = function(state)
 			evt.SuccessfulFoundation = true;
 
 		// The entity was destroyed but its data may still be useful, so
-		// remember the entity and this AI's metadata concerning it
+		// remember the AI's metadata concerning it
 		evt.metadata = {};
-		evt.entityObj = this._entities.get(evt.entity);
 		for (const player of this._players)
 			evt.metadata[player] = this._entityMetadata[player][evt.entity];
 

binaries/data/mods/public/simulation/ai/petra/_petrabot.js

@@ -146,7 +146,6 @@ PetraBot.prototype.Serialize = function()
 			const evtmod = {};
 			for (const keyevt in evt)
 				evtmod[keyevt] = evt[keyevt];
-			evtmod.entityObj = undefined;
 			savedEvents[key][i] = evtmod;
 		}
 	}