update parent theme for marl and attar (#5569)

attar/style.css

@@ -10,7 +10,7 @@ Requires PHP: 5.7
 Version: 0.0.1
 License: GNU General Public License v2 or later
 License URI: https://raw.githubusercontent.com/Automattic/themes/trunk/LICENSE
-Template: Blockbase
+Template: blockbase
 Text Domain: attar
 Tags: one-column, custom-colors, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, rtl-language-support, theme-options, threaded-comments, translation-ready, wide-blocks, auto-loading-homepage
-*/
+*/

marl/style.css

@@ -10,7 +10,7 @@ Requires PHP: 5.7
 Version: 0.0.1
 License: GNU General Public License v2 or later
 License URI: https://raw.githubusercontent.com/Automattic/themes/trunk/LICENSE
-Template: Blockbase
+Template: blockbase
 Text Domain: marl
 Tags: one-column, custom-colors, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, rtl-language-support, theme-options, threaded-comments, translation-ready, wide-blocks, auto-loading-homepage
-*/
+*/