MC-943: Grouping content blocks and containers in the Panel

- revert misspelling to match bluefoot

Author: anthoula

dev/tests/integration/_files/Magento/TestModulePageBuilderDataMigration/Setup/install_data.json

@@ -565,7 +565,7 @@
             "plural_name": null,
             "include_in_sitemap": "0",
             "searchable": "0",
-            "icon_class": "icon-bluefoot-accordion",
+            "icon_class": "icon-bluefoot-accordian",
             "color": "#5284bd",
             "show_in_page_builder": "1",
             "sort_order": "0",
@@ -873,7 +873,7 @@
             "plural_name": null,
             "include_in_sitemap": "0",
             "searchable": "0",
-            "icon_class": "icon-bluefoot-accordion",
+            "icon_class": "icon-bluefoot-accordian",
             "color": "#5284bd",
             "show_in_page_builder": "1",
             "sort_order": "100",