[web] use new toolbar icons (in common)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35793 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.312.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35794 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e