' services: don't clear wallpaper when SystemUI

disconnects.

When we restart SystemUI (or the user), sometimes
the wallpaper would get cleared. This patch just
captures its originating component and
if that is our SystemUI component, ignore the event.

Change-Id: I3e159dc2c013e7d7e552e3c0cef55e3ab970ca87
Signed-off-by: Roman Birg <romanbirg@gmail.com>

 fb: add ticker entries only if we are not recreating statusbar

if both happens at the same time it will result in an systemUI crash.
Funny that since 2 years where this method exist no one discovered it.
Due to the new theme lightsensor mode we have way more switches so
maybe thats why I got it now

whatever we had already a check but the tick method can be called from
outside as well so just check if we are in the recreation or not and return
if we are in recreation process. Old check is now redundant and can be
removed