Disable settings search on all subactivities.

This leaves the search in place in multi-pane configurations, and keeps
it only in the main settings screen for single-pane configurations.

Change-Id: I2db74193d534b66e1faf20293996c611621dfe58
SuperSU header
[2/2] Profile: Remove screen lock mode
[2/2] Profile: Screen timeout
[2/2] Buttons: Switch to last app
[2/2] Buttons: Immersive mode
[2/2] Quick pulldown: center
[2/2] Smart pulldown
[2/2] Volume panel timeout
[2/2] Global actions: Mobile data
[2/2] Global actions: Wifi
[2/2] NavBar: Enable with s-pen
[2/2] Battery light: Quiet hours & 100% charged
[2/2] Low battery warning policy
[2/2] Recent apps: Clear all button: Location
[2/2] Recent apps: RAM bar
[2/2] Network traffic indicator
[2/2] Floating window
[2/2] Lockscreen notifications