QuickSettings: Use plurals for Bluetooth tile

* Some languages need this

Change-Id: I953aee702fcc381dd4bfb3a18fa183341a138ba3
(cherry picked from commit 52e7f2ce9dff501bcf5123b66979693762620218)
framework: Close system windows when performing 'switch to last app' action

This fixes a bug where performing the action while on the recent apps screen
would cause the next attempt to open recent apps require two presses of the
recent apps button (the first press would toggle it closed, rather than open).

It also prevents the switch from being obscured by the notifications shade.

Change-Id: I2220149ce604a25501121abc29e5d88f8b1cbf4f
(cherry picked from commit 36ab5b65de9d83c9067c738158d31f00f6f42cc2)