Fix can't start injected item problem

Should set highlight Preference key after
isDuplicateClick to ensure clicked Preference
key & highlight Preference are different and
then isDuplicateClick returns a correct value.

Bug: 233553587
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.dashboard
      manual
      1. Click all left pane items and see if there is any launch problem.
      2. Check if duplicate click check works.

Change-Id: Ic6394b96896fd3a0fb926707565f63beff74a27b