[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/bing.py

@@ -6,11 +6,8 @@
 import re
 from urllib.parse import urlencode
 from lxml import html
-from searx import logger
 from searx.utils import eval_xpath, extract_text, match_language
 
-logger = logger.getChild('bing engine')
-
 # about
 about = {
     "website": 'https://www.bing.com',