HW/WiiSave: Fix reversed condition in WriteFiles

This didn't make any sense, as it would only attempt to create the directory if it already existed, and would simply fail if it didn't exist.

Source/Core/Core/HW/WiiSave.cpp

@@ -143,7 +143,7 @@ public:
       else if (file.type == SaveFile::Type::Directory)
       {
         const FS::Result<FS::Metadata> meta = m_fs->GetMetadata(*m_uid, *m_gid, path);
-        if (!meta || meta->is_file)
+        if (meta && meta->is_file)
           return false;
 
         const FS::ResultCode result = m_fs->CreateDirectory(*m_uid, *m_gid, path, 0, modes);