Try to fix applets

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29268 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.222.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29269 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3691: BackgroundImageModelin 'Basic' tab of Object Properties. Model is used in desktop version.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29270 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e