Userland: Preserve keyboard mapping preference on reboot (#6955)

Author: https://github.com/Omerktn 🔰
Commit: d922c2f5f3
Pull-request: https://github.com/SerenityOS/serenity/pull/6955
Reviewed-by: https://github.com/awesomekling

Base/etc/Keyboard.ini

@@ -0,0 +1,2 @@
+[Mapping]
+Keymap=en-us

Base/etc/SystemServer.ini

@@ -161,6 +161,10 @@ AcceptSocketConnections=1
 KeepAlive=1
 User=anon
 
+[KeyboardPreferenceLoader]
+KeepAlive=0
+User=anon
+
 [TestRunner@ttyS0]
 Executable=/home/anon/tests/run-tests-and-shutdown.sh
 StdIO=/dev/ttyS0