SysUI : Fix opacity of LastApp Icon

Thanks to Nitroz for making alpha corrected versions of the
last app icon.

Change-Id: I2e8a9ae36e32f03aa36d3218c74d76b88123e64e
Signed-off-by: Zaphod <mwilson@acesappraisal.com>
Merge "SysUI : Fix opacity of LastApp Icon" into jb-mr1