SyncEngine: invalid the blacklist entry when the rename destination change

SyncEngine: invalid the blacklist entry when the rename destination change

The problem in this case is if we rename the file "xxx" to "invalid\file".
The rename will fail because the new filename constains a slash, and it
will be blacklisted.
But then if the user re-rename the file to "valid_name", then we should
invalidate the blacklist entry and retry to upload. But we did not do
that because renaming don't change the mtime and we did not store the
rename target in the database

IL issue 558