UBSan-detected overflow when nWidthPixel is LONG_MAX and rCurrentZoom is 1
UBSan-detected overflow when nWidthPixel is LONG_MAX and rCurrentZoom is 1

...from the call to

 SetColumnWidth( nId, LONG_MAX );

in BrowseBox::AutoSizeLastColumn(), e.g. happens when opening the Gallery in
Draw.

Change-Id: I151ae557d9d2bec52ecb0bd92b870fb0b91d7242

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core