lib: Make $fname mandatory in DatabaseInnerTermStoreCloner

For a private function the $fname does not need to be optional,
it should be easy to pass it always.

Change-Id: I453a8d7afb8f077fc847c806a49a8b8f1ce2f748

Author: umherirrender

lib/includes/Store/Sql/Terms/DatabaseInnerTermStoreCleaner.php

@@ -303,7 +303,7 @@ private function selectFieldValuesForPrimaryKey(
 		string $selectedVar,
 		string $primaryKeyVar,
 		array $primaryKeyValues,
-		string $fname = __METHOD__
+		string $fname
 	): array {
 		$values = $this->dbr->newSelectQueryBuilder()
 			->select( $selectedVar )