[drop] engine torrentz: torrentz2.eu and torrentz2.is are offline

[1] https://torrentfreak.com/torrentz2-eu-domain-suspended-by-registry-on-public-prosecutors-order-200628/

Suggested-by: @rasos searx/searx#1875 (comment)
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -1134,7 +1134,7 @@ engines:
     engine: solidtorrents
     shortcut: solid
     timeout: 3.0
-    disabled: true
+    disabled: false
 
   # For this demo of the sqlite engine download:
   #   https://liste.mediathekview.de/filmliste-v2.db.bz2
@@ -1156,12 +1156,6 @@ engines:
   #      ORDER BY duration DESC
   #   disabled: false
 
-  - name: torrentz
-    engine: torrentz
-    shortcut: tor
-    url: https://torrentz2.eu/
-    timeout: 3.0
-
   # Requires Tor
   - name: torch
     engine: xpath