Bug 1677806 - Set network.dns.dns_query_single_label to false r=Gijs

This seems to have caused a bunch of regressions. We'll likely try to enable
it at a later time.

Differential Revision: https://phabricator.services.mozilla.com/D97597

modules/libpref/init/StaticPrefList.yaml

@@ -8546,7 +8546,7 @@
 # API instead of PR_GetAddrInfoByName
 - name: network.dns.dns_query_single_label
   type: RelaxedAtomicBool
-  value: true
+  value: false
   mirror: always
 
 # The proxy type. See nsIProtocolProxyService.idl