[UWS, TAP] Ensure the backup file rotation always deletes the temporary backup

file (actually, replaces the real backup file by the temporary one).

Sometimes a temporary backup file (i.e. a file named like `*.backup.temp-*`) is
not deleted. This means that the log rotation fails and that, potentially, some
jobs have not been updated/deleted. This commit is there is re-enforce the
replacement operation.