Remove DVL_API_FOR_TEST for HasHellfireMpq

Author: Yggdrasill

Source/engine/assets.hpp

@@ -304,7 +304,7 @@ constexpr int MainMpqPriority = 1000;
 constexpr int DevilutionXMpqPriority = 9000;
 constexpr int LangMpqPriority = 9100;
 constexpr int FontMpqPriority = 9200;
-extern DVL_API_FOR_TEST bool HasHellfireMpq;
+extern bool HasHellfireMpq;
 
 void LoadCoreArchives();
 void LoadLanguageArchive();