Fix crash when dismissing suggestions.

When the suggestions are in default mode and the number of suggestions
are more than the default count, we set the sublist of the suggestions
list as the suggestion adapter data. In this case, operation on the list
should be done in the sublist instead of the original list to maintain
the list consistency check.

Hence, when dismissing the suggestion, change to remove the suggestion
from the suggestion adapter instead of from the dashboard adapter, so
that any following interaction with the suggestions will not trigger the
concurrent modification exception.

Bug: 64279080
Test: make RunSettingsRoboTests
Change-Id: I970b6af8a1c72bc0c3ee89fef890ae6a669c71d2