Update pref fragment for "see all" in app & notification

Instead of launching intent, now to launches all app list as a
subsetting. This is more consistent with the other setting pages and
fixes a task affinity issue.

Change-Id: I0464a2b8f46d46f06bcf297c0f876ae12a7c490b
Fixes: 74205806
Test: robotests
2 files changed