localectl doesn't work on modern Debian/Ubuntu [1] [2]

The keyboard: section should be used instead, which should do the right
thing on whatever platform cloud-init is being used on (writes
/etc/default/keyboard on Debian/Ubuntu, uses localectl on RHEL/Fedora,
runs setup-keymap on Alpine).

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038762

[2]: 2030788

src/OptionsPopup.qml

@@ -787,8 +787,9 @@ Window {
             addFirstRun("fi")
 
             addCloudInit("timezone: "+fieldTimezone.editText)
-            addCloudInitRun("localectl set-x11-keymap \""+fieldKeyboardLayout.editText+"\" pc105")
-            addCloudInitRun("setupcon -k --force || true")
+            addCloudInit("keyboard:")
+            addCloudInit("  model: pc105")
+            addCloudInit("  layout: \"" + fieldKeyboardLayout.editText + "\"")
         }
 
         if (firstrun.length) {