uimode: don't start dock app during SUW on watch

- Starting dock activity on watch during SetupWizard can cause user not
  being able to go back to the previous activity, due to how navigation
  works during set up.
- This fixes a problem for settings activity is started as part of the
  setup process.

Test: manual
Bug: 388435736
Flag: EXEMPT, bugfix
Change-Id: Icfc6d879760dde4097497938aeb80da1c7a9a745