Quick Settings: Use scaled font size (2/2)

Set the font size for quick settings tiles to match the design docs
for 'Text size micro'.

Change-Id: Ie0c80af1a538d6b61db8c513b44a51ead264e4e3
Lockscreen Targets : Fix empty magnetic behaviour

When no valid targets are set, set settings to null in order
to enable magnetic targets (aosp behavior)

Change-Id: I0ccaad25cc85f55b99e4c34cb4ffe2d06bda4a80