If we click button to enable DisplayOverOtherApps for monado, use
back button to com back to Launcher and hot-start monado app, the
disabled status fragment is not removed, and enabled status fraqgment is
added top on disabled status fragment, that causes text overlap.
This CL will use FragmentTransaction#replace instead of
FragmentTransaction#add to ensure there is only one
DisplayOverOtherAppsStatusFragment, and new status will replace old
status without any overlap.
Signed-off-by: utzcoz <utzcoz@outlook.com>