[bp/r53298][MOD] Don't always include flash in Tiki.
Note: the flash plugin is enabled by default. To avoid using flash it must be disabled (in addition to this modification)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@53300 b456876b-0849-0410-b77d-98878d47e9d5