[FIX] elfinder: tikiFileFromHash doesn't need file contents, and when saved in database the (binary) data breaks the JSON encoding, preventing images being inserted in wiki pages. Should fix wish4913 (thanks Pascal)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48449 b456876b-0849-0410-b77d-98878d47e9d5