CAS-14774: set hasSPW(false) when SPW axis is absent in lazy BDF flag path
In processCorrelatorFlags (used when importasdm lazy=True bdfflags=True),
the else-branch of the SPW size check incorrectly called hasSPW(true) when
the announced and calculated flag buffer sizes did not match, meaning the
SPW axis is genuinely absent. This caused traverseALMACorrelatorFlagsAxes
to misread the flags buffer layout and apply fewer flags than the non-lazy
path (processCorrelatorFlagsPerSlices), which already had the correct
hasSPW(false) call.
