Declare optional argument after required.

This prevents PHP fatal error when plugin is added to the one of parent classes.
Error example: 'Error: Cannot instantiate interface Magento\Framework\Data\OptionSourceInterface'

Author: vovayatsyuk

app/code/Magento/MediaGalleryUi/Ui/Component/Listing/Filters/Asset.php

@@ -33,8 +33,8 @@ class Asset extends Select
      * @param UiComponentFactory $uiComponentFactory
      * @param FilterBuilder $filterBuilder
      * @param FilterModifier $filterModifier
-     * @param OptionSourceInterface $optionsProvider
      * @param GetContentByAssetIdsInterface $getContentIdentities
+     * @param OptionSourceInterface $optionsProvider
      * @param array $components
      * @param array $data
      * @SuppressWarnings(PHPMD.ExcessiveParameterList)
@@ -44,8 +44,8 @@ public function __construct(
         UiComponentFactory $uiComponentFactory,
         FilterBuilder $filterBuilder,
         FilterModifier $filterModifier,
-        OptionSourceInterface $optionsProvider = null,
         GetContentByAssetIdsInterface $getContentIdentities,
+        OptionSourceInterface $optionsProvider = null,
         array $components = [],
         array $data = []
     ) {