Compare to 0 when it is needed to know whether there are any
recalc bits set. Set to 0 when the ID is fully updated.
The ID_RECALC_ALL was used for such checks due to legacy reasons,
where particle system recalc flags were encoded into same field
in DNA but used different set of bits. Now all recalc bits have
common nature, no need to separate them.
Since the ID_RECALC_ALL is assigned to all ones in binary there
expected to be no changes in behavior.