wallpaper: fix null service manager registered to server

- Don't getService WallPaperManagerService within ctor.

BUG: 277380463
Change-Id: I4297ee0e39318b6ce11744b36fb1690a2e1e10ca
(cherry picked from commit 07871890903a38d6524d8db984bf21352b8646b5)
1 file changed