[bp/r52286][FIX] draw: Include svg data in checksum to allow "drawn on" images to be stored when fgal_allow_duplicates is enabled

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@52287 b456876b-0849-0410-b77d-98878d47e9d5