Resolves: fdo#81277 missing table cell background color in doc/html import

a regression from one of the DrawingLayer FillAttributes
changes of...

commit 7d9bb549d498d6beed2c4050c402d09643febdfa
Author: Armin Le Grand <alg@apache.org>
Date:   Mon Jun 2 15:00:50 2014 +0000

    Related: #i124638# Second step of DrawingLayer FillAttributes...

    for Writer objects, now added support for Paragraph and PageStyle (including
    Header and Footer) for direct attributes and style attributes

commit 4a0b5e569d070c286daefb0fdfe45c0dd15d241c
Author: Armin Le Grand <alg@apache.org>
Date:   Thu Apr 17 16:44:58 2014 +0000

    i#124638 support for DrawingLayre FillStyle for GraphicFrames and ...

    ... EmbeddedObjectFrames in Writer

commit 6e61ecd09679a66060f932835622821d39e92f01
Author: Armin Le Grand <alg@apache.org>
Date:   Wed Mar 19 16:17:02 2014 +0000

    Merge back branch alg_writerframes to trunk

all of which set all RES_FLYFRMFMT and RES_FRMFMT SwFmts
to use the new fill attributes, but

a) didn't change the aTableBoxSetRange for SwTableBoxFmt to include the XFILL
attributes, so importing cell bgs from .doc got dropped
b) didn't make any effort in the uno api for XCells to do the same sort
of mapping that was done for XFrames

its unclear to me if SwDrawFrmFmt is actually adapted or not, I've
assumed that it is here

Change-Id: I8d71def2aef6163099a16591f9e53ba2b430bd06