TANGO: add icons for .uno:FormatColumns

Change-Id: Iee75eee636e333526b1fb35e8071ed5e9a194bb2
Reviewed-on: https://gerrit.libreoffice.org/13193
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>