ENYO-466: Tooltips shouldn't receive mouse events, so now they don't.

When moving the cursor over a translucent-but-present part of the tooltip flag, the tooltip decorator would lose focus/spotlight, causing the tooltip to dismiss and later re-appear. Setting the Tooltip to not be able to receive mouse events makes much more sense, as tooltips by their very definition aren't interact-able.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>