fix cross-volume dedup moves

• read-only demo server at https://a.ocv.me/pub/demo/
• docker image ╱ similar software ╱ client testbed

no vulnerabilities since 2023-07-23

• there is a discord server with an @everyone in case of future important updates
• v1.8.7 (2023-07-23) - CVE-2023-38501 - reflected XSS
• v1.8.2 (2023-07-14) - CVE-2023-37474 - path traversal (first CVE)
  • all serverlogs reviewed so far (5 public servers) showed no signs of exploitation

bugfixes

• v1.6.2 introduced a bug which, when moving files between volumes, could cause the move operation to abort when it encounters a deduplicated file

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⚠️ not the latest version!