Add #7525: Allow autoreplace with same model vehicle

src/autoreplace_cmd.cpp

@@ -60,9 +60,6 @@ bool CheckAutoreplaceValidity(EngineID from, EngineID to, CompanyID company)
 {
 	assert(Engine::IsValidID(from) && Engine::IsValidID(to));
 
-	/* we can't replace an engine into itself (that would be autorenew) */
-	if (from == to) return false;
-
 	const Engine *e_from = Engine::Get(from);
 	const Engine *e_to = Engine::Get(to);
 	VehicleType type = e_from->type;