Refactor sysapp hasDemoCard function

The sys ui changed in F release, where there is no preview peak view.
Refactor hasDemoCard function based on this new feature to fix recent
test failure.

Sample
run:https://sponge.corp.google.com/invocation?tab=Test+Cases&show=FAILED&show=INTERNAL_ERROR&id=96270526-8ac3-4ef5-9cbf-55692bcf749a

bug:35929754
Change-Id: Ic75ed0a3a4d5bbc41bec637578c81b904dc9affc