fix: not logging explain query for estimated count

Fixes https://github.com/PostgREST/postgrest/issues/4319

src/PostgREST/ApiRequest/Preferences.hs

@@ -19,6 +19,7 @@ module PostgREST.ApiRequest.Preferences
   , PreferMaxAffected(..)
   , fromHeaders
   , shouldCount
+  , shouldExplainCount
   , prefAppliedHeader
   ) where
 
@@ -238,6 +239,10 @@ shouldCount :: Maybe PreferCount -> Bool
 shouldCount prefCount =
   prefCount == Just ExactCount || prefCount == Just EstimatedCount
 
+shouldExplainCount :: Maybe PreferCount -> Bool
+shouldExplainCount prefCount =
+  prefCount == Just PlannedCount || prefCount == Just EstimatedCount
+
 -- | Whether to commit or roll back transactions.
 data PreferTransaction
   = Commit   -- ^ Commit transaction - the default.