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Remove redundant cleanupOldLWS from simple reconcile path

cleanupDrainedLWS already runs at the start of every reconcile and
handles all old revisions where every role is at 0 replicas. The
simple path is only reached when totalOldReplicas == 0, so
cleanupDrainedLWS has already cleaned them up.

Signed-off-by: Mathis Felardos <mathis@mistral.ai>