fixed bug with DD cut-off check and PME DLB

During the initial stage of PME DLB, the cut-off limit check for the
DD DLB was not checked correcty. This reduced the effectiveness of
both DD and PME DLB and could lead to missing interactions during
a very limited number of steps.
Fixes #1169

Change-Id: I0b0cac22d4abbe8a9b0c16488aeb662d7d4d9bcc