[bugfix] Fix Transliterator for Lao char

Change-Id: I0ae7ea4b62a3491ee75c2b2a9e50d2b1ea2e9175

Author: xqt

pywikibot/userinterfaces/transliteration.py

@@ -1148,7 +1148,7 @@ def transliterate(self, char: str, default: str = '?',
             result = prev
         # Lao
         elif char == 'ຫ':
-            result = '' if next in 'ງຍນຣລຼຼວ' else 'h'
+            result = '' if succ in 'ງຍນຣລຼຼວ' else 'h'
         return result