Reduce the getAppPath and autoloader calls

The getAppPath will always return the same data for the same appId. It
is actually already cached. However we do some cleanup of the appId
(again). Same for the autoloading it is actually already checked.

This just removes the unneeded calls. Which can add up if you have a lot
of incomming shares.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>