Revert "ensure only one record per pid in DynamoDBOffsetStore saveTim…

…estampOffsets"

This reverts commit d8dd7bf.

akka-projection-dynamodb/src/main/scala/akka/projection/dynamodb/internal/DynamoDBOffsetStore.scala

@@ -391,8 +391,9 @@ private[projection] class DynamoDBOffsetStore(
           records
             .groupBy(_.pid)
             .valuesIterator
-            .map(_.maxBy(_.seqNr))
-            .filterNot(oldState.isDuplicate _)
+            .collect {
+              case recordsByPid if !oldState.isDuplicate(recordsByPid.last) => recordsByPid.last
+            }
             .toVector
         }
       }