Do not cache artwork vor Kodi 18 Leia or later

- Seems Kodi is doing a better job at it then PKC
- PKC caching could mess with Kodi threads trying to cache artwork that needs to show up immediately

resources/lib/sync.py

@@ -155,7 +155,8 @@ class Sync(backgroundthread.KillableThread):
             utils.settings('plex_status_fanarttv_lookup', value=utils.lang(107))
 
     def start_image_cache_thread(self):
-        if not utils.settings('enableTextureCache') == "true":
+        if (not utils.settings('enableTextureCache') == "true" or
+                v.KODIVERSION >= 18):
             LOG.info('Image caching has been deactivated')
             return
         if self.image_cache_thread and self.image_cache_thread.is_alive():