Remove many ERROR outputs from non-debug NSE output

scripts/http-backup-finder.nse

@@ -100,7 +100,7 @@ action = function(host, port)
     -- most of them are "legitimate" and should not be reason to abort
     if ( not(status) ) then
       if ( r.err ) then
-        return stdnse.format_output(true, "ERROR: %s", r.reason)
+        return stdnse.format_output(false, r.reason)
       else
         break
       end