Fix memory leak when closing Title Sequence handle.

The handle is now invalid after calling TitleSequenceCloseParkHandle().

src/openrct2/title/TitleSequence.cpp

@@ -166,6 +166,7 @@ extern "C"
         {
             Memory::Free(handle->HintPath);
             delete ((IStream *)handle->Stream);
+            Memory::Free(handle);
         }
     }