Sidebar: Remove hightlight from TabBar after Deck close

After clicking on "Close Sidebar Deck" the highlighted icon
will now lose its highlight.

Change-Id: Iee947641343d46c84af7afb93cd52101e39149f7
Sidebar: Use proper default value for Deck

gsDefaultDeckId is "PropertyDeck". Deck "default" does not exist
and triggers a fallback, which is the first Deck in the list, which is
"PropertyDeck", too.

Change-Id: If2daa53d002c6547cc5f6fbed1408719c10b149d
fdo#67627 Clicking on icons of the sidebar should both open and close Decks

Change-Id: I921a8a0b749df62c50f0ae8cb2de85f6cb459784
Sidebar: Ensure Deck is open, if we choose an element from the Deck popup menu.

Otherwise the Deck will be changed, but not shown...

Change-Id: I4be7756542a8c21a616e7615ef40535e7310b90c