Disable touch screen edge modification, but allow the user to open an edge context menu and see the settings.
To set an edge immutable, just add `[$i]` right after the entry in `TouchEdges` group, although the edges settings are shared between some `[Effect-something]` group under the key `TouchBorderActivateSomething`.
Since one entry like `TouchBorderActivateSomething` lists all edges that use this effect, it doesn't make sense to set it immutable.