Fix so that scans closed before execute are removed from "scans to send list"


ndb/include/ndbapi/NdbTransaction.hpp:
  Fix so that scans closed before execute are removed from "scans to send list"
ndb/src/ndbapi/NdbScanOperation.cpp:
  Fix so that scans closed before execute are removed from "scans to send list"
ndb/src/ndbapi/NdbTransaction.cpp:
  Fix so that scans closed before execute are removed from "scans to send list"