tether setting: fix test error: updateDisplay_shouldUpdateValue

ag/10257734 change band convert to general design.
Fix test to match new design

Bug: 149251992
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.wifi
Test: make RunSettingsRoboTests ROBOTEST_FILTER=CodeInspectionTest
Change-Id: I6f09d9d4f440515fb51a237d966327e232fe5928
1 file changed