silkworm: assertion failed when snapshot repository contains unfinished Recsplit index files

[canepat]

Restarting Silkworm after an unexpected termination may lead to another termination due to the following assertion failed:

  INFO [12-23|18:40:34.694 UTC] Silkworm                                 version=master0.1.0-dev+commit.b0ce84b9 build=linux-x86_64 release compiler=gnu 11.4.0 
  INFO [12-23|18:40:34.695 UTC] Opening database                         path=/root/.local/share/silkworm/chaindata 
  INFO [12-23|18:40:34.695 UTC] Database schema                          version=6.1.0 
  INFO [12-23|18:40:34.695 UTC] Starting Silkworm                        chain=1 config=...
  INFO [12-23|18:40:34.695 UTC] Effective pruning                        mode=--prune= 
  INFO [12-23|18:40:34.695 UTC] Reopen snapshot repository folder: /root/.local/share/silkworm/snapshots
Assert failed: leaf_size == LEAF_SIZE Source: /opt/silkworm/silkworm/db/datastore/snapshots/rec_split/rec_split.hpp, line 309

This is caused by the unfinished download of some RecSplit index files.