The search and bookmark icons aren't used, instead their duplicates
in "sfx/res" respectively "res" are used.
LibO's help system does not actually display zooming or annotation buttons.
"helperdialog" is the function that can enable/disable our Clippy replacement
– no need to have that in a toolbar, no need for an icon.
"help" wasnt picked up, it seems.
"helpmenu" had a scissors icon.
"helpdownload" only was a X icon.

Change-Id: I22d31c6c123dd92c5c0be8ee610583c1c77226d5