refactor: 불필요한 파라미터 제거

Author: sapiens2000

src/main/java/com/example/log4u/common/oauth2/handler/OAuth2AuthenticationSuccessHandler.java

@@ -76,7 +76,7 @@ private void setCookieAndSaveRefreshToken(
 		String refresh = jwtUtil.createJwt(REFRESH_TOKEN_KEY, userId, name, role, refreshTokenValidityInSeconds);
 
 		// 리프레시 토큰 DB 저장
-		refreshTokenService.saveRefreshToken(null, name, refresh);
+		refreshTokenService.saveRefreshToken(name, refresh);
 
 		response.addCookie(createCookie(ACCESS_TOKEN_KEY, access));
 		response.addCookie(createCookie(REFRESH_TOKEN_KEY, refresh));