Fix phone mode task bar inset values not correctly initialized

We rely on contentHeightToReportToApps and tappableHeightToReportToApps (that ultimately call into DeviceProfile) of TaskbarStashController to initialize the insets. However, DeviceProfile only initializes those values when isTaskbarPresent is true. Rather than completely changing the initialization of DeviceProfile, we special case in TaskbarStashController that uses the bar height for inset

Bug: 274517647
Test: turn on FLAG_HIDE_NAVBAR_WINDOW and TASKBAR_NO_RECREATION, make sure the insets are correct in both 3 button and gesture nav mode
Change-Id: I164a6e2c9f9d24888155b45325ee8ce46ca2c39f