Make staticlib in battle library an unique ptr.

src/Battling/Library/BattleLibrary.cpp

@@ -15,8 +15,6 @@ BattleLibrary::BattleLibrary(const CreatureLib::Library::DataLibrary* staticLib,
     AssertNotNull(_miscLibrary);
 }
 
-BattleLibrary::~BattleLibrary() { delete _staticLib; }
-
 const std::unique_ptr<const CreatureLib::Library::LibrarySettings>& BattleLibrary::GetSettings() const noexcept {
     return _staticLib->GetSettings();
 }