webadmin: StorageView tabs - disable highlight in chrome

IscsiStorageView.ui.xml:
Added 'outline: none' to the tabs to disable highlight in chrome.

Screenshot-of-defect: http://imgur.com/XUl7ZTl

Change-Id: I82e10323e555ce368f9dc21261a971e392dd3f13
Signed-off-by: Daniel Erez <derez@redhat.com>