Show always the clean cache button on the caching page

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge branch 'master' of https://github.com/Spuds/Elkarte
Missing global

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge pull request #96 from emanuele45/master

missing global (and clean cache button)