Fix formatting issues in sliding list partitioning

Follow-up from
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/73406

lib/gitlab/database/partitioning/partition_manager.rb

@@ -73,6 +73,7 @@ module Gitlab
                                        partition_name: partition.partition_name,
                                        table_name: partition.table)
               end
+
               model.partitioning_strategy.after_adding_partitions
             end
           end

spec/lib/gitlab/database/partitioning/sliding_list_strategy_spec.rb

@@ -37,8 +37,8 @@ RSpec.describe Gitlab::Database::Partitioning::SlidingListStrategy do
   describe '#current_partitions' do
     it 'detects both partitions' do
       expect(strategy.current_partitions).to eq([
-                                         Gitlab::Database::Partitioning::SingleNumericListPartition.new(table_name, 1, partition_name: '_test_partitioned_test_1'),
-                                         Gitlab::Database::Partitioning::SingleNumericListPartition.new(table_name, 2, partition_name: '_test_partitioned_test_2')
+        Gitlab::Database::Partitioning::SingleNumericListPartition.new(table_name, 1, partition_name: '_test_partitioned_test_1'),
+        Gitlab::Database::Partitioning::SingleNumericListPartition.new(table_name, 2, partition_name: '_test_partitioned_test_2')
       ])
     end
   end