ND2: fix tile reading when the X coordinate is > 0 (rebased onto dev_5_0)



This is the same as gh-1209 but rebased onto dev_5_0.

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Fixes https://trac.openmicroscopy.org.uk/ome/ticket/12454.  Importing the file from QA 7799 into OMERO should result in an image that looks identical to what is shown when opening the same file in ImageJ (or Matlab, or showinf).  The weird banding shown in the screenshot attached to the ticket should not be present.