tdf#75256 - Sifr drawchart and formatdialog icons suggested by jay

-drawchart icons has now three pieces but only one seperated one.
-lc version of the formatdialog icons has now a non equal sign.
-dark pie same size as the seperated one.

Change-Id: If6373232cff67ec18ad8e5f8bb9e65176cce20ad