[mod] defaults: disable image engines with poor results (#6690)

The image search defaults are a bit of a mix of results atm with random stock photos, some broken thumbnails (artic) and svg icons.

searx/settings.yml

@@ -428,6 +428,7 @@ engines:
     engine: artic
     shortcut: arc
     timeout: 4.0
+    disabled: true
 
   - name: artstation
     engine: artstation
@@ -726,6 +727,7 @@ engines:
     engine: devicons
     shortcut: di
     timeout: 3.0
+    disabled: true
 
   - name: ddg definitions
     engine: duckduckgo_definitions
@@ -1006,6 +1008,7 @@ engines:
   - name: flickr
     shortcut: fl
     engine: flickr_noapi
+    disabled: true
 
   - name: flickr_api
     # You can use the engine using the official stable API, but you need an API
@@ -1573,6 +1576,7 @@ engines:
     engine: lucide
     shortcut: luc
     timeout: 3.0
+    disabled: true
 
   - name: luxxle
     engine: luxxle