Write the dirty block index and block-file entries to the database.
Declared in <node/blockstorage.h>
[[requires_capability(0x7f2e1b098d78), requires_capability(0x7f2e26d1a4d8), requires_capability(0x7f2e375e05b8), requires_capability(0x7f2e33367978), requires_capability(0x7f2e3542e968), requires_capability(0x7f2e28a734c8)]]
void
WriteBlockIndexDB();