update `addtodash` icon.
update `addtodash` icon.

dashkb/metabase,dashkb/metabase,blueoceanideas/metabase,dashkb/metabase,blueoceanideas/metabase,blueoceanideas/metabase,blueoceanideas/metabase,dashkb/metabase,dashkb/metabase,blueoceanideas/metabase