Fix synchronization of rc_deleted, log_deleted, ipb_deleted, ar_deleted, rev_deleted

[lahwaacz]

For these two log events: https://wiki.archlinux.org/api.php?action=query&list=logevents&letype=delete&lestart=20200528T084046Z&lelimit=2

The first event set bits 1 and 2, the second event unset bit 2, so the resulting value should be 1 - but wiki-scripts set 0, i.e. the value of the new bitmask.

If some bits are set and others unset in the same event, the log will be even harder to understand... Detailed testing is needed!

[lahwaacz]

PostgreSQL bitwise operators: https://www.postgresql.org/docs/current/functions-math.html