OMETIFFFormat: fix savePlane method overriding

With the addition of an AbstractWriter#writePlane method, the
OMETIFFFormat was overriding the wrong method, which prevented proper
writer initialization.
OMETIFFFormat: fix tiff data tags

Was computing indices incorrectly (e.g. using sizeC, sizeC, sizeT to
compute zct coordinates) and was not accounting for dimension order when
writing tiff comments, leading to bad tiff data.