Use scaled font size for no recent apps text

Change-Id: Ib200928db09bcdd6661de5e450e2fc9c1b5566cf
SystemUI: Fix missing top task in recent panel.

If preloadRecentTasksList was not called or was called too
late and RecentsActivty already started and last top activity has
excludeFromRecents flag setted it might be missing
from recent application list.

Change-Id: Idf7153824805ceea9fcaf04ac645b73a5e93a4d9