correct completion of showing argument names at keyword call end

Author: d-biehl

robotcode/language_server/robotframework/parts/completion.py

@@ -1661,7 +1661,7 @@ async def _complete_KeywordCall_or_Fixture(  # noqa: N802
             return None
 
         if (
-            token_at_position.type == RobotToken.EOL
+            token_at_position.type in [RobotToken.EOL, RobotToken.SEPARATOR]
             and len(tokens_at_position) > 1
             and tokens_at_position[-2].type == RobotToken.KEYWORD
         ):