Update config to include contentBlock for sliders

Author: kkartunov

config/contentful/tc-core.json

@@ -749,7 +749,8 @@
             "validations": [
               {
                 "linkContentType": [
-                  "banner"
+                  "banner",
+                  "contentBlock"
                 ]
               }
             ],
@@ -3576,4 +3577,4 @@
   ],
   "roles": [
   ]
-}
+}