internetarchivescholar engine: set timeout to 15 seconds

searx/settings.yml

@@ -1580,7 +1580,7 @@ engines:
   - name: internetarchivescholar
     engine: internet_archive_scholar
     shortcut: ias
-    timeout: 5.0
+    timeout: 15.0
 
   - name: superuser
     engine: stackexchange