[REVIEW-3-5] fix for fdo#44337, margin information are not symmetric in sc

[Markus Mohrhard]

Hey,

[1] removes an old ugly hack for n#361358 which is no longer needed. I
checked with Kohei and the old patch was necessary for xls import but
we now use the saved row height during xls import. Without this hackw
e have again a symmetric margin and old documents are imported
correctly.

[2] fixes a related bug that the "Synchronize" checkbox in the border
dialog is checked even if the margins are not synchronized.

I think that both patches are safe and help to bring the calc cell
borders back on track.

Regards,
Markus

[1] http://cgit.freedesktop.org/libreoffice/core/commit/?id=843dd3f75e4d35b8ae5fd3be6804e54233292948
[2] http://cgit.freedesktop.org/libreoffice/core/commit/?id=149650b087ab5b15ef23e4ac6af5368b2820af1e