BibTasklets: SCOAP3 importer upload improvement

* Changes `--append` to `--correct` for uploading fulltexts from
  SCOAP3 to INSPIRE.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Merge pull request #55 from jalavik/scoap3-import-improvement

BibTasklets: SCOAP3 importer upload improvement