[mod] one logger per engine - drop obsolete logger.getChild

Remove the no longer needed `logger = logger.getChild(...)` from engines.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/yahoo_news.py

@@ -14,7 +14,6 @@ from datetime import datetime, timedelta
 from dateutil import parser
 from lxml import html
 
-from searx import logger
 from searx.utils import (
     eval_xpath_list,
     eval_xpath_getindex,
@@ -23,8 +22,6 @@ from searx.utils import (
 
 from searx.engines.yahoo import parse_url
 
-logger = logger.getChild('yahoo_news engine')
-
 # about
 about = {
     "website": 'https://news.yahoo.com',