remove an unnecessary call to unset_dns

The below patch removes an unnecessary call to unset_dns. It is already called in del_if and causes an error message since the interface does not exist anymore when called here. Regards, Arjen

index e690944..d2c7753 100755
@@ -300,7 +300,6 @@ cmd_down() {
   execute_hooks "${PRE_DOWN[@]}"
   [[ $SAVE_CONFIG -eq 0 ]] || save_config
   del_if
- unset_dns
   execute_hooks "${POST_DOWN[@]}"

}

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del_if only hits it if it was previously set by the same process.
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