Issue #3456947 by kapetan: 'check_roles' is not a supported key'

Closes #3456947

config/schema/insert_block.schema.yml

+filter_settings.filter_insert_block:
+  type: filter
+  label: 'Insert Block Filter'
+  mapping:
+    check_roles:
+      type: boolean
+      label: 'Check roles permissions'
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