Prevent new torrent from saving resume data twice

PR #17951.

src/base/bittorrent/sessionimpl.cpp

@@ -2753,6 +2753,9 @@ bool SessionImpl::addTorrent_impl(const std::variant<MagnetUri, TorrentInfo> &so
 
     p.flags |= lt::torrent_flags::duplicate_is_error;
 
+    // Prevent torrent from saving initial resume data twice
+    p.flags &= ~lt::torrent_flags::need_save_resume;
+
     p.added_time = std::time(nullptr);
 
     // Limits