Give the Lao keyboard choice a Lao desktop layout

The row used la-latin1, kbd's Latin American Spanish keymap, so Lao
installs typed Spanish. There is no Lao console keymap; like Korean, the
console stays US and the desktop gets la, which Omarchy keeps behind US
as a non-Latin layout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/shell.d/input-method-checks.py

@@ -117,6 +117,10 @@ class InputMethodTest(unittest.TestCase):
     setup.defaults(self.config, fresh=False)
     self.assertEqual(path.read_text(), "[Behavior]\nActiveByDefault=True\n")
 
+  def test_lao_preference_keeps_a_latin_fcitx_keyboard(self):
+    self.preference.write_text("INPUT_METHOD=none\nXKB_LAYOUT=la\n")
+    self.assertEqual(setup.selection(), ("none", "us"))
+
   def test_korean_preference_yields_to_a_later_keyboard_change(self):
     self.preference.write_text("INPUT_METHOD=hangul\nXKB_LAYOUT=kr\n")
     self.assertEqual(setup.selection(), ("hangul", "kr"))