refactor: Remove unused vars (#213)

sample_config.py

@@ -17,4 +17,3 @@ ARQ_API_URL = os.environ.get('ARQ_API_URL', 'https://arq.hamker.in')
 LOG_MENTIONS = os.environ.get('LOG_MENTIONS', 'True').lower() in ['true', '1']
 RSS_DELAY = int(os.environ.get('RSS_DELAY', 300))
 PM_PERMIT = os.environ.get('PM_PERMIT', 'True').lower() in ['true', '1']
-SLAP_STICKERS = list(map(str, os.environ.get('SLAP_STICKERS').split()))