avoid repeated table layouting (fdo#75622)

With the document from fdo#75622, this saves 3775 calls and leaves only 13.
e586fe4585dc07e6f6dd061d09f6a7fb0b22948c removed avoiding the call
to LayoutTable(), which made loading slow. I checked that the doc from that
bugreport still works, so if very original code was correct in avoiding
the call sometimes, this should be ok too.

Conflicts:
	svx/source/table/svdotable.cxx

Change-Id: Ia80f974d4497e5cb04612331527eb87b579ddb76
Reviewed-on: https://gerrit.libreoffice.org/8738
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>