Use overlay settings for Swipe Up gesture default

Implements the following logic:

if config_swipe_up_gesture_setting_available is false, always use the
default value in config_swipe_up_gesture_default and ignore
Settings.Secure

if config_swipe_up_gesture_setting_available is true, use
config_swipe_up_gesture_default as the default value for
Settings.Secure, and respect Settings.Secure if user makes any changes.

Bug: 78641268
Test: Manual test
Change-Id: I586083b6655ccb3c94f08a911ed0de80f4738d62