[INTERNAL] removed Screensharing View from plugin descriptor

Feature was removed with commit
8c8e70d29f8aea1f95b6d24ff2ee948cba351970.

Change-Id: Ie437f3de1ad6758aea24e1afde343db69ce4ef00
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1342
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>