[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/core.py

@@ -9,11 +9,8 @@ from json import loads
 from datetime import datetime
 from urllib.parse import urlencode
 
-from searx import logger
 from searx.exceptions import SearxEngineAPIException
 
-logger = logger.getChild('CORE engine')
-
 about = {
     "website": 'https://core.ac.uk',
     "wikidata_id": 'Q22661180',
@@ -29,8 +26,6 @@ nb_per_page = 10
 
 api_key = 'unset'
 
-logger = logger.getChild('CORE engine')
-
 base_url = 'https://core.ac.uk:443/api-v2/search/'
 search_string = '{query}?page={page}&pageSize={nb_per_page}&apiKey={apikey}'