Adjust assert
Adjust assert

If user cancels recursive operation at STAGE_PROCESS_TRANSFER_QUEUE, we
will have increased pendingTransfers for every transfer added to
temporal transfer queue, before calling
MegaApiImpl::sendPendingTransfers, however if we return from
sendPendingTransfers before adding subtransfers onRequestFinish won't
be called for those subtransfers and pendingTransfers won't be
decreased.

meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk