[DO NOT MERGE] Fixed a bug where restored promise icons stay promise icons.

Test:
1 Turn off WiFi
2 Install app. (Promise icon gets added to home screen).
3 Backup launcher.
4 Restore launcher.
5 Turn on WiFi
6 Note promise icon gets updated with as installation progresses.

Will submit to future/master later.

Bug: 140212732
Change-Id: I63cedc6c16f5028297fb1a0852ffbd4473319ae9