Fix default values for the deprecated API throttle

The AddThrottleDeprecatedApiColumns migration does not currently match
the db/structure.sql file, which was missed in final review. Add a new
migration to ensure that the default values via migration match those
in db/structure.sql

Changelog: fixed

db/migrate/20210930081208_fix_deprecated_api_throttle_defaults.rb

+# frozen_string_literal: true
+
+class FixDeprecatedApiThrottleDefaults < Gitlab::Database::Migration[1.0]
+  def change
+    change_column_default :application_settings, :throttle_unauthenticated_deprecated_api_requests_per_period, from: 3600, to: 1800
+    change_column_default :application_settings, :throttle_authenticated_deprecated_api_period_in_seconds, from: 1800, to: 3600
+  end
+end

db/schema_migrations/20210930081208

+4b2c1b8e80f481d2dbbcfcb61c0a3d3081cbe4081fdd710040a028d72bd5d0e4
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