Codechange: do not use MallocT for the pool

Needed to make the placement new operator use Tindex over size_t because of
ambiguity for the delete operator variant that also has the size.

src/company_cmd.cpp

@@ -583,7 +583,7 @@ Company *DoStartupNewCompany(bool is_ai, CompanyID company = CompanyID::Invalid(
 		c = new Company(STR_SV_UNNAMED, is_ai);
 	} else {
 		if (Company::IsValidID(company)) return nullptr;
-		c = new (company.base()) Company(STR_SV_UNNAMED, is_ai);
+		c = new (company) Company(STR_SV_UNNAMED, is_ai);
 	}
 
 	c->colour = colour;